General information

Product type designation

CM 1241 RS422/485

CM 1241 RS232

Supply voltage

Rated value (DC)

• ● 24 V DC

Yes

Yes

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

Number of interfaces

1

1

Interface physics, RS 232C (V.24)

Yes

Interface (physical) RS 422/485 (X.27)

Yes

Point-to-point

• ● 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

Yes

Yes

• — Modbus RTU master

Yes

Yes

• — MODBUS RTU slave

Yes

Yes

• — USS

Yes; Available as library function

Protocols

Integrated protocols

Freeport

• — egram 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)

• — egram 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

Diagnostic functions

Yes

Yes

Diagnostics indication LED

• ● for status of the outputs

Yes

Yes

Degree and class of protection

Degree of protection acc. to EN 60529

• ● IP20

Yes

Yes

Standards, approvals, certificates

CE mark

Yes

Yes

cULus

Yes

Yes

FM approval

Yes

Yes

RCM (formerly C-TICK)

Yes

Yes

KC 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