The CPU 314C-2 PtP is the compact CPU for systems with demanding requirements regarding processing performance and speed of response. With its extended main memory, this compact CPU is also suitable for medium-sized applications. Integrated digital and analog inputs/outputs permit a direct connection to the process, the second serial interface allows the connection of additional I/O devices such as barcode scanner, printer, etc.

Siemens PLC S7-300 Product Specifications:

Article number	6ES7314-6BH04-0AB0
	CPU314C-2PTP, 24DI/16DO/5AI/2AO, 192 KB
General information
HW functional status	1
Firmware version	V3.3
Engineering with
● Programming package	STEP 7 as of V5.5 + SP1 or STEP 7 V5.3 + SP2 or higher with HSP 204
Supply voltage
Rated value (DC)	24 V
permissible range, lower limit (DC)	19.2 V
permissible range, upper limit (DC)	28.8 V
external protection for power supply lines (recommendation)	Miniature circuit breaker, type C; min. 2 A; miniature circuit breaker type B, min. 4 A
Mains buffering
● Mains/voltage failure stored energy time	5 ms
● Repeat rate, min.	1 s
Load voltage L+
Digital inputs
— Rated value (DC)	24 V
— Reverse polarity protection	Yes
Digital outputs
— Rated value (DC)	24 V
— Reverse polarity protection	No
Input current
Current consumption (rated value)	660 mA
Current consumption (in no-load operation), typ.	150 mA
Inrush current, typ.	5 A
I²t	0.7 A²·s
Digital inputs
● from load voltage L+ (without load), max.	80 mA
Digital outputs
● from load voltage L+, max.	50 mA
Power loss
Power loss, typ.	13 W
Memory
Work memory
● integrated	192 kbyte
● expandable	No
Load memory
● Plug-in (MMC)	Yes
● Plug-in (MMC), max.	8 Mbyte
● Data management on MMC (after last programming), min.	10 y
Backup
● present	Yes; Guaranteed by MMC (maintenance-free)
● without battery	Yes; Program and data
CPU processing times
for bit operations, typ.	0.06 µs
for word operations, typ.	0.12 µs
for fixed point arithmetic, typ.	0.16 µs
for floating point arithmetic, typ.	0.59 µs
CPU-blocks
Number of blocks (total)	1 024; (DBs, FCs, FBs); the maximum number of loadable blocks can be reduced by the MMC used.
DB
● Number, max.	1 024; Number range: 1 to 16000
● Size, max.	64 kbyte
FB
● Number, max.	1 024; Number range: 0 to 7999
● Size, max.	64 kbyte
FC
● Number, max.	1 024; Number range: 0 to 7999
● Size, max.	64 kbyte
OB
● Number, max.	see instruction list
● Size, max.	64 kbyte
● Number of free cycle OBs	1; OB 1
● Number of time alarm OBs	1; OB 10
● Number of delay alarm OBs	2; OB 20, 21
● Number of cyclic interrupt OBs	4; OB 32, 33, 34, 35
● Number of process alarm OBs	1; OB 40
● Number of startup OBs	1; OB 100
● Number of asynchronous error OBs	4; OB 80, 82, 85, 87
● Number of synchronous error OBs	2; OB 121, 122
Nesting depth
● per priority class	16
● additional within an error OB	4
Counters, timers and their retentivity
S7 counter
● Number	256
Retentivity
— adjustable	Yes
— lower limit	0
— upper limit	255
— preset	Z 0 to Z 7
Counting range
— lower limit	0
— upper limit	999
IEC counter
● present	Yes
● Type	SFB
● Number	Unlimited (limited only by RAM capacity)
S7 times
● Number	256
Retentivity
— adjustable	Yes
— lower limit	0
— upper limit	255
— preset	No retentivity
Time range
— lower limit	10 ms
— upper limit	9 990 s
IEC timer
● present	Yes
● Type	SFB
● Number	Unlimited (limited only by RAM capacity)
Data areas and their retentivity
Retentive data area (incl. timers, counters, flags), max.	64 kbyte
Flag
● Size, max.	256 byte
● Retentivity available	Yes; MB 0 to MB 255
● Retentivity preset	MB 0 to MB 15
● Number of clock memories	8; 1 memory byte
Data blocks
● Retentivity adjustable	Yes; via non-retain property on DB
● Retentivity preset	Yes
Local data
● per priority class, max.	32 kbyte; Max. 2048 bytes per block
Address area
I/O address area
● Inputs	1 024 byte
● Outputs	1 024 byte
of which distributed
— Inputs	none
— Outputs	none
Process image
● Inputs	1 024 byte
● Outputs	1 024 byte
● Inputs, adjustable	1 024 byte
● Outputs, adjustable	1 024 byte
● Inputs, default	128 byte
● Outputs, default	128 byte
Default addresses of the integrated channels
— Digital inputs	124.0 to 126.7
— Digital outputs	124.0 to 125.7
— Analog inputs	752 to 761
— Analog outputs	752 to 755
Digital channels
● Inputs	1 016
— of which central	1 016
● Outputs	1 008
— of which central	1 008
Analog channels
● Inputs	253
— of which central	253
● Outputs	250
— of which central	250
Hardware configuration
Number of expansion units, max.	3
Number of DP masters
● integrated	none
● via CP	4
Number of operable FMs and CPs (recommended)
● FM	8
● CP, PtP	8
● CP, LAN	10
Rack
● Racks, max.	4
● Modules per rack, max.	8; In rack 3 max. 7
Time of day
Clock
● Hardware clock (real-time)	Yes
● retentive and synchronizable	Yes
● Backup time	6 wk; At 40 °C ambient temperature
● Deviation per day, max.	10 s; Typ.: 2 s
● Behavior of the clock following POWER-ON	Clock continues running after POWER OFF
● Behavior of the clock following expiry of backup period	the clock continues at the time of day it had when power was switched off
Operating hours counter
● Number	1
● Number/Number range	0
● Range of values	0 to 2^31 hours (when using SFC 101)
● Granularity	1 h
● retentive	Yes; Must be restarted at each restart
Clock synchronization
● supported	Yes
● to MPI, master	Yes
● to MPI, slave	Yes
● in AS, master	Yes
● in AS, slave	No
Digital inputs
Number of digital inputs	24
● of which inputs usable for technological functions	16
integrated channels (DI)	24
Input characteristic curve in accordance with IEC 61131, type 1	Yes
Number of simultaneously controllable inputs
horizontal installation
— up to 40 °C, max.	24
— up to 60 °C, max.	12
vertical installation
— up to 40 °C, max.	12
Input voltage
● Rated value (DC)	24 V
● for signal “0”	-3 to +5V
● for signal “1”	+15 to +30 V
Input current
● for signal “1”, typ.	8 mA
Input delay (for rated value of input voltage)
for standard inputs
— parameterizable	Yes; 0.1 / 0.3 / 3 / 15 ms (You can reconfigure the input delay of the standard inputs during program runtime. Please note that under certain circumstances your newly set filter time may not be effective until the next filter cycle.)
— Rated value	3 ms
for technological functions
— at “0” to “1”, max.	8 µs; Minimum pulse width/minimum pause between pulses at maximum counting frequency
Cable length
● shielded, max.	1 000 m; 50 m for technological functions
● unshielded, max.	600 m; for technological functions: No
for technological functions
— shielded, max.	50 m; at maximum count frequency
— unshielded, max.	not allowed
Digital outputs
Number of digital outputs	16
● of which high-speed outputs	4; Notice: You cannot connect the fast outputs of your CPU in parallel
integrated channels (DO)	16
Short-circuit protection	Yes; Clocked electronically
● Response threshold, typ.	1 A
Limitation of inductive shutdown voltage to	L+ (-48 V)
Controlling a digital input	Yes
Switching capacity of the outputs
● on lamp load, max.	5 W
Load resistance range
● lower limit	48 Ω
● upper limit	4 kΩ
Output voltage
● for signal “1”, min.	L+ (-0.8 V)
Output current
● for signal “1” rated value	500 mA
● for signal “1” permissible range, min.	5 mA
● for signal “1” permissible range, max.	0.6 A
● for signal “1” minimum load current	5 mA
● for signal “0” residual current, max.	0.5 mA
Parallel switching of two outputs
● for uprating	No
● for redundant control of a load	Yes
Switching frequency
● with resistive load, max.	100 Hz
● with inductive load, max.	0.5 Hz
● on lamp load, max.	100 Hz
● of the pulse outputs, with resistive load, max.	2.5 kHz
Total current of the outputs (per group)
horizontal installation
— up to 40 °C, max.	3 A
— up to 60 °C, max.	2 A
vertical installation
— up to 40 °C, max.	2 A
Cable length
● shielded, max.	1 000 m
● unshielded, max.	600 m
Analog inputs
Number of analog inputs	5
● For voltage/current measurement	4
● For resistance/resistance thermometer measurement	1
integrated channels (AI)	5; 4x current/voltage, 1x resistance
permissible input voltage for current input (destruction limit), max.	5 V; Permanent
permissible input voltage for voltage input (destruction limit), max.	30 V; Permanent
permissible input current for voltage input (destruction limit), max.	0.5 mA; Permanent
permissible input current for current input (destruction limit), max.	50 mA; Permanent
Electrical input frequency, max.	400 Hz
No-load voltage for resistance-type transmitter, typ.	3.3 V
Constant measurement current for resistance-type transmitter, typ.	1.25 mA
Technical unit for temperature measurement adjustable	Yes; Degrees Celsius / degrees Fahrenheit / Kelvin
Input ranges
● Voltage	Yes; ±10 V / 100 kΩ; 0 V to 10 V / 100 kΩ
● Current	Yes; ±20 mA / 100 Ω; 0 mA to 20 mA / 100 Ω; 4 mA to 20 mA / 100 Ω
● Resistance thermometer	Yes; Pt 100 / 10 MΩ
● Resistance	Yes; 0 Ω to 600 Ω / 10 MΩ
Input ranges (rated values), voltages
● 0 to +10 V	Yes
— Input resistance (0 to 10 V)	100 kΩ
Input ranges (rated values), currents
● 0 to 20 mA	Yes
— Input resistance (0 to 20 mA)	100 Ω
● -20 mA to +20 mA	Yes
— Input resistance (-20 mA to +20 mA)	100 Ω
● 4 mA to 20 mA	Yes
— Input resistance (4 mA to 20 mA)	100 Ω
Input ranges (rated values), resistance thermometer
● Pt 100	Yes
— Input resistance (Pt 100)	10 MΩ
Input ranges (rated values), resistors
● 0 to 600 ohms	Yes
— Input resistance (0 to 600 ohms)	10 MΩ
Thermocouple (TC)
Temperature compensation
— parameterizable	No
Characteristic linearization
● parameterizable	Yes; by software
— for resistance thermometer	Pt 100
Cable length
● shielded, max.	100 m
Analog outputs
Number of analog outputs	2
integrated channels (AO)	2
Voltage output, short-circuit protection	Yes
Voltage output, short-circuit current, max.	55 mA
Current output, no-load voltage, max.	14 V
Output ranges, voltage
● 0 to 10 V	Yes
● -10 V to +10 V	Yes
Output ranges, current
● 0 to 20 mA	Yes
● -20 mA to +20 mA	Yes
● 4 mA to 20 mA	Yes
Connection of actuators
● for voltage output two-wire connection	Yes; Without compensation of the line resistances
● for voltage output four-wire connection	No
● for current output two-wire connection	Yes
Load impedance (in rated range of output)
● with voltage outputs, min.	1 kΩ
● with voltage outputs, capacitive load, max.	0.1 µF
● with current outputs, max.	300 Ω
● with current outputs, inductive load, max.	0.1 mH
Destruction limits against externally applied voltages and currents
● Voltages at the outputs towards MANA	16 V; Permanent
● Current, max.	50 mA; Permanent
Cable length
● shielded, max.	200 m
Analog value generation for the inputs
Measurement principle	Actual value encryption (successive approximation)
Integration and conversion time/resolution per channel
● Resolution with overrange (bit including sign), max.	12 bit
● Integration time, parameterizable	Yes; 16.6 / 20 ms
● Interference voltage suppression for interference frequency f1 in Hz	50 / 60 Hz
● Time constant of the input filter	0.38 ms
● Basic execution time of the module (all channels released)	1 ms
Analog value generation for the outputs
Integration and conversion time/resolution per channel
● Resolution with overrange (bit including sign), max.	12 bit
● Conversion time (per channel)	1 ms
Settling time
● for resistive load	0.6 ms
● for capacitive load	1 ms
● for inductive load	0.5 ms
Encoder
Connection of signal encoders
● for voltage measurement	Yes
● for current measurement as 2-wire transducer	Yes; with external supply
● for current measurement as 4-wire transducer	Yes
● for resistance measurement with two-wire connection	Yes; Without compensation of the line resistances
● for resistance measurement with three-wire connection	No
● for resistance measurement with four-wire connection	No
Connectable encoders
● 2-wire sensor	Yes
— permissible quiescent current (2-wire sensor), max.	1.5 mA
Errors/accuracies
Temperature error (relative to input range), (+/-)	0.006 %/K
Crosstalk between the inputs, min.	60 dB
Repeat accuracy in steady state at 25 °C (relative to input range), (+/-)	0.06 %
Output ripple (relative to output range, bandwidth 0 to 50 kHz), (+/-)	0.1 %
Linearity error (relative to output range), (+/-)	0.15 %
Temperature error (relative to output range), (+/-)	0.01 %/K
Crosstalk between the outputs, min.	60 dB
Repeat accuracy in steady state at 25 °C (relative to output range), (+/-)	0.06 %
Operational error limit in overall temperature range
● Voltage, relative to input range, (+/-)	1 %
● Current, relative to input range, (+/-)	1 %
● Resistance, relative to input range, (+/-)	1 %
● Voltage, relative to output range, (+/-)	1 %
● Current, relative to output range, (+/-)	1 %
Basic error limit (operational limit at 25 °C)
● Voltage, relative to input range, (+/-)	0.8 %; Linearity error ±0.06 %
● Current, relative to input range, (+/-)	0.8 %; Linearity error ±0.06 %
● Resistance, relative to input range, (+/-)	0.8 %; Linearity error ±0.2 %
● Resistance thermometer, relative to input range, (+/-)	0.8 %
● Voltage, relative to output range, (+/-)	0.8 %
● Current, relative to output range, (+/-)	0.8 %
Interference voltage suppression for f = n x (f1 +/- 1 %), f1 = interference frequency
● Series mode interference (peak value of interference < rated value of input range), min.	30 dB
● Common mode interference, min.	40 dB
Interfaces
Number of industrial Ethernet interfaces	0
Number of PROFINET interfaces	0
Number of RS 485 interfaces	1; MPI
Number of RS 422 interfaces	1; RS 422 / 485 combined
Point-to-point connection
● Cable length, max.	1 200 m
Integrated protocol driver
— 3964 (R)	Yes
— ASCII	Yes
— RK 512	Yes
Transmission rate, RS 422/485
— with 3964 (R) protocol, max.	19.2 kbit/s; 38.4 kbit/s half duplex; 19.2 kbit/s full duplex
— with ASCII protocol, max.	19.2 kbit/s; 38.4 kbit/s half duplex; 19.2 kbit/s full duplex
— with RK 512 protocol, max.	19.2 kbit/s; 38.4 kbit/s half duplex; 19.2 kbit/s full duplex
1. Interface
Interface type	Integrated RS 485 interface
Isolated	No
Interface types
● RS 485	Yes
● Output current of the interface, max.	200 mA
Protocols
● MPI	Yes
● PROFIBUS DP master	No
● PROFIBUS DP slave	No
● Point-to-point connection	No
MPI
● Transmission rate, max.	187.5 kbit/s
Services
— PG/OP communication	Yes
— Routing	No
— Global data communication	Yes
— S7 basic communication	Yes
— S7 communication	Yes; Only server, configured on one side
— S7 communication, as client	No; but via CP and loadable FB
— S7 communication, as server	Yes
2. Interface
Interface type	Integrated RS 422/ 485 interface
Isolated	Yes
Interface types
● RS 485	Yes; RS 422 / 485 (X.27)
● Output current of the interface, max.	No
Protocols
● MPI	No
● PROFINET IO Controller	No
● PROFINET IO Device	No
● PROFINET CBA	No
● PROFIBUS DP master	No
● PROFIBUS DP slave	No
● Point-to-point connection	Yes
Point-to-point connection
● Transmission rate, max.	19.2 kbit/s; 38.4 kbit/s half duplex; 19.2 kbit/s full duplex
● Interface controllable from the user program	Yes
● Interface can trigger alarm/interrupt in the user program	Yes; Message on break – identification
Protocols
PROFIsafe	No
communication functions / header
PG/OP communication	Yes
Data record routing	No
Global data communication
● supported	Yes
● Number of GD loops, max.	8
● Number of GD packets, max.	8
● Number of GD packets, transmitter, max.	8
● Number of GD packets, receiver, max.	8
● Size of GD packets, max.	22 byte
● Size of GD packet (of which consistent), max.	22 byte
S7 basic communication
● supported	Yes
● User data per job, max.	76 byte
● User data per job (of which consistent), max.	76 byte; 76 bytes (with X_SEND or X_RCV); 64 bytes (with X_PUT or X_GET as server)
S7 communication
● supported	Yes
● as server	Yes
● as client	Yes; Via CP and loadable FB
● User data per job, max.	180 kbyte; With PUT/GET
● User data per job (of which consistent), max.	240 byte; as server
S5 compatible communication
● supported	Yes; via CP and loadable FC
Number of connections
● overall	12
● usable for PG communication	11
— reserved for PG communication	1
— adjustable for PG communication, min.	1
— adjustable for PG communication, max.	11
● usable for OP communication	11
— reserved for OP communication	1
— adjustable for OP communication, min.	1
— adjustable for OP communication, max.	11
● usable for S7 basic communication	8
— reserved for S7 basic communication	0
— adjustable for S7 basic communication, min.	0
— adjustable for S7 basic communication, max.	8
S7 message functions
Number of login stations for message functions, max.	12; Depending on the configured connections for PG/OP and S7 basic communication
Process diagnostic messages	Yes
simultaneously active Alarm-S blocks, max.	300
Test commissioning functions
Status block	Yes; Up to 2 simultaneously
Single step	Yes
Number of breakpoints	4
Status/control
● Status/control variable	Yes
● Variables	Inputs, outputs, memory bits, DB, times, counters
● Number of variables, max.	30
— of which status variables, max.	30
— of which control variables, max.	14
Forcing
● Forcing	Yes
● Forcing, variables	Inputs, outputs
● Number of variables, max.	10
Diagnostic buffer
● present	Yes
● Number of entries, max.	500
— adjustable	No
— of which powerfail-proof	100; Only the last 100 entries are retained
● Number of entries readable in RUN, max.	499
— adjustable	Yes; From 10 to 499
— preset	10
Service data
● can be read out	Yes
Interrupts/diagnostics/status information
Diagnostics indication LED
● Status indicator digital input (green)	Yes
● Status indicator digital output (green)	Yes
Integrated Functions
Frequency measurement	Yes
● Number of frequency meters	4; up to 60 kHz (see “Technological Functions” manual)
controlled positioning	Yes
integrated function blocks (closed-loop control)	Yes; PID controller (see “Technological Functions” manual)
PID controller	Yes
Number of pulse outputs	4; Pulse width modulation up to 2.5 kHz (see “Technological Functions” Manual)
Limit frequency (pulse)	2.5 kHz
Potential separation
Potential separation digital inputs
● Potential separation digital inputs	Yes
● between the channels	No
● between the channels and backplane bus	Yes
Potential separation digital outputs
● Potential separation digital outputs	Yes
● between the channels	Yes
● between the channels, in groups of	8
● between the channels and backplane bus	Yes
Potential separation analog inputs
● Potential separation analog inputs	Yes; common for analog I/O
● between the channels	No
● between the channels and backplane bus	Yes
Potential separation analog outputs
● Potential separation analog outputs	Yes; common for analog I/O
● between the channels	No
● between the channels and backplane bus	Yes
Isolation
Isolation tested with	600 V DC
Ambient conditions
Ambient temperature during operation
● min.	0 °C
● max.	60 °C
configuration / header
Configuration software
● STEP 7	Yes; STEP 7 V5.5 + SP1 or higher or STEP 7 V5.3 + SP2 or higher with HSP 203
● STEP 7 Lite	No
configuration / programming / header
● Command set	see instruction list
● Nesting levels	8
● System functions (SFC)	see instruction list
● System function blocks (SFB)	see instruction list
Programming language
— LAD	Yes
— FBD	Yes
— STL	Yes
— SCL	Yes
— CFC	Yes
— GRAPH	Yes
— HiGraph®	Yes
Know-how protection
● User program protection/password protection	Yes
● Block encryption	Yes; With S7 block Privacy
Dimensions
Width	120 mm
Height	125 mm
Depth	130 mm
Weights
Weight, approx.	680 g