No tools needed for one-handed wiring using push-in terminals
Actuation of the spring NC contacts with a standard screwdriver, with a blade width up to 3.5 mm
Outstanding access due to arrangement of measuring tap, spring NC contacts and cable entry in columns, while at the same time reducing the space required by 64%
Fault-proof color coding of the spring NC contacts for better orientation in the terminal panel
Replacement of I/O modules during operation without affecting the wiring
Operation with module gaps (gaps without I/O module)
Automatic coding of the I/O modules prevents destruction of the electronics if a module is accidentally inserted in the wrong slot during replacement
High EMC interference immunity:
- self-assembling shielded backplane bus
- multi-layer conductor plate with shield levels for interference-free signal transmission from the terminal to the I/O module
- system-integrated, space-saving shield connection for quick installation
Self-assembling potential groups without external wiring or jumpers
Replaceable terminal box
Side-by-side latching of the BUs for high mechanical and EMC loads
Optional module-specific color identification of the terminals according to the color code CC
Optional equipment marking using slide-in equipment labeling plates

An ET 200SP station can be expanded via one ‘BU-Send’ BaseUnit with a “BA-Send” BusAdapter plugged onto it with up to 16 modules from the ET 200AL series of I/O devices with IP67 protection.

Siemens BaseUnit ET 200SP Product Specifications:

Article number	6ES7193-6BP00-0DU0	6ES7193-6B0-0BU0P0
	BaseUnit Type U0, BU20-P16+A0+2D, PU 1	BaseUnit Type U0, BU20-P16+A0+2B, PU 1
General information
Product type designation	BU type U0	BU type U0
HW functional status	FS10 and higher	FS10 and higher
Supply voltage
Rated value (DC)	See manual	See manual
● For P1 and P2 bus	120 V	120 V
● For AUX bus	120 V; Equal potential group to P1/P2 bus or PE	120 V; Equal potential group to P1/P2 bus or PE
● for process terminals	120 V	120 V
Rated value (AC)	See manual	See manual
● For P1 and P2 bus	277 V	277 V
● For AUX bus	277 V; Equal potential group to P1/P2 bus or PE	277 V; Equal potential group to P1/P2 bus or PE
● for process terminals	277 V	277 V
external protection for power supply lines	Yes
Mains filter
● integrated	No	No
Current carrying capacity
up to 60 °C, max.	10 A	10 A
For P1 and P2 bus, max.	10 A	10 A
For AUX bus, max.	10 A	10 A
For process terminals, max.	10 A; Point of contact, derating depends on the module	10 A; Point of contact, derating depends on the module
Hardware configuration
Automatic encoding	Yes	Yes
Formation of potential groups
● New potential group	Yes	No
● Potential group continued from the left	No	Yes
Slots
● Number of slots	1	1
Potential separation
between backplane bus and supply voltage	Yes	Yes
between process terminals and supply voltage	Yes; Not applicable for process terminals 15 and 16	Yes; Not applicable for process terminals 15 and 16
between power bus and supply voltage	No	No
Isolation
Isolation tested with	3 100 V DC	3 100 V DC
Ambient conditions
Ambient temperature during operation
● horizontal installation, min.	-30 °C	-30 °C
● horizontal installation, max.	60 °C	60 °C
● vertical installation, min.	-30 °C	-30 °C
● vertical installation, max.	50 °C	50 °C
Altitude during operation relating to sea level
● Installation altitude above sea level, max.	3 000 m	3 000 m
connection method / header
Terminals
● Terminal type	Push-in terminal	Push-in terminal
● Conductor cross-section, min.	0.14 mm²; 0.2 mm² without wire end ferrule	0.14 mm²; 0.2 mm² without wire end ferrule
● Conductor cross-section, max.	2.5 mm²; 1.5 mm² with wire end ferrule	2.5 mm²; 1.5 mm² with wire end ferrule
● Number of process terminals to I/O module	16	16
● Number of terminals to AUX bus	0	0
● Number of add-on terminals	0	0
● Number of terminals with connection to P1 and P2 bus	2	2
Dimensions
Width	20 mm	20 mm
Height	117 mm	117 mm
Depth	35 mm	35 mm
Weights
Weight, approx.	50 g	50 g