Article number	6ES7241-1CH32-0XB0	6ES7241-1AH32-0XB0
	Communication Module cm 1241, RS422/485	Communication Module cm 1241, RS232
General information
Product type designation	CM 1241 RS 422 / 485	CM 1241 RS 232
Supply voltage
Rated value (DC)	24 V	24 V
permissible range, lower limit (DC)	20.4 V	20.4 V
permissible range, upper limit (DC)	28.8 V	28.8 V
Input current
Current consumption, max.	220 mA; From backplane bus 5 V DC	200 mA; From backplane bus 5 V DC
Power loss
Power loss, typ.	1.1 W	1.1 W
Interfaces
Interfaces/bus type	RS 422 / 485 (X.27)	RS 232C (V.24)
Number of interfaces	1	1
Point-to-point connection
● Cable length, max.	1 000 m	10 m
Integrated protocol driver
— Freeport	Yes	Yes
— ASCII	Yes; Available as library function	Yes; Available as library function
— Modbus RTU master	Yes	Yes
— MODBUS RTU slave	Yes	Yes
— USS	Yes; Available as library function
Protocols
Integrated protocols
Freeport
— Telegram length, max.	1 kbyte	1 kbyte
— Bits per character	7 or 8	7 or 8
— Number of stop bits	1 (Standard), 2	1 (Standard), 2
— Parity	No parity (standard); even, uneven, mark (parity bit always 1); space (parity bit always 0)	No parity (standard); even, uneven, mark (parity bit always 1); space (parity bit always 0)
3964 (R)
— Telegram length, max.	1 kbyte	1 kbyte
— Bits per character	7 or 8	7 or 8
— Number of stop bits	1 (Standard), 2	1 (Standard), 2
— Parity	No parity (standard); even, uneven, mark (parity bit always 1); space (parity bit always 0)	No parity (standard); even, uneven, mark (parity bit always 1); space (parity bit always 0)
Modbus RTU master
— Address area	1 through 49 999 (Standard Modbus addressing)	1 through 49 999 (Standard Modbus addressing)
— Number of slaves, max.	247; slave numbers 1 through 247, per MODBUS network segment maximum 32 devices, additional repeaters needed to expand the network to maximum configuration	247; slave numbers 1 through 247, per MODBUS network segment maximum 32 devices, additional repeaters needed to expand the network to maximum configuration
MODBUS RTU slave
— Address area	1 through 49 999 (Standard Modbus addressing)	1 through 49 999 (Standard Modbus addressing)
Interrupts/diagnostics/status information
Diagnostics function	Yes	Yes
Diagnostics indication LED
● for status of the outputs	Yes	Yes
Degree and class of protection
IP degree of protection	IP20	IP20
Standards, approvals, certificates
CE mark	Yes	Yes
CSA approval	Yes	Yes
UL approval	Yes	Yes
cULus	Yes	Yes
FM approval	Yes	Yes
RCM (formerly C-TICK)	Yes	Yes
KC approval	Yes	Yes
Marine approval	Yes	Yes
Ambient conditions
Free fall
● Fall height, max.	0.3 m; five times, in product package	0.3 m; five times, in product package
Ambient temperature during operation
● min.	-20 °C	-20 °C
● max.	60 °C	60 °C
● horizontal installation, min.	-20 °C	-20 °C
● horizontal installation, max.	60 °C	60 °C
● vertical installation, min.	-20 °C	-20 °C
● vertical installation, max.	50 °C	50 °C
● permissible temperature change	5°C to 55°C, 3°C / minute	5°C to 55°C, 3°C / minute
Ambient temperature during storage/transportation
● min.	-40 °C	-40 °C
● max.	70 °C	70 °C
Air pressure acc. to IEC 60068-2-13
● Operation, min.	795 hPa	795 hPa
● Operation, max.	1 080 hPa	1 080 hPa
● Storage/transport, min.	660 hPa	660 hPa
● Storage/transport, max.	1 080 hPa	1 080 hPa
Relative humidity
● Operation at 25 ℃ without condensation, max.	95 %	95 %
Dimensions
Width	30 mm	30 mm
Height	100 mm	100 mm
Depth	75 mm	75 mm
Weights
Weight, approx.	155 g	150 g