How to Select an Interface Relay for PLC Outputs
A step-by-step guide to matching PLC output type, coil voltage and current, contact rating, and socket style when selecting an interface relay.
- Part number
- 6ES7241-1CH32-0XB0
- Model no
- CM 1241 RS 422 / 485
In stock · 50+
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· From Türkiye
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SIMATIC S7-1200Siemens 6ES7241-1CH32-0XB0 SIMATIC S7-1200 CM 1241 RS422/485 PLC Communication Module
SIMATIC S7-1200 CM 1241 RS422/485 communication module, Freeport/Modbus RTU/USS drivers.
Description
About the CM 1241 RS 422 / 485
About the CM 1241 RS 422 / 485
The Siemens 6ES7241-1CH32-0XB0 is a SIMATIC S7-1200 CM 1241 communication module with an RS422/485 (X.27) serial interface on a 9-pin D-sub socket, supporting point-to-point connections up to 1,000 m. Integrated protocol drivers cover Freeport, ASCII, Modbus RTU master and slave, and USS, letting the module link directly to third-party serial devices or Siemens drives without an external gateway.
Certifications & Standards
- CE mark
- CSA approval
- UL approval
- cULus
- FM approval
- RCM
- KC approval
- Marine approval
Selection Notes
RS422/485 gives a two- or four-wire multi-drop link, so it fits Modbus RTU networks with multiple slave devices on one segment, up to 247 addresses under standard Modbus addressing (32 devices per physical segment before a repeater is needed). Where the target device only exposes an RS232 port, the RS232-only CM 1241 variant in the same family is the correct choice instead of this module. The USS protocol driver, available as a library function, lets this module talk directly to Siemens drives over serial USS without a separate PROFIBUS or PROFINET drive interface.
Applications
Serial connection to third-party Modbus RTU devices, legacy point-to-point ASCII equipment, or Siemens drives over USS from an S7-1200 CPU that lacks a native RS422/485 port.
Specification
Full specification
General information 1
| Product type designation | CM 1241 RS 422 / 485 |
|---|
Supply voltage 3
| Rated value (DC) | 24 V |
|---|---|
| permissible range, lower limit (DC) | 20.4 V |
| permissible range, upper limit (DC) | 28.8 V |
Input current 1
| Current consumption, max. | 220 mA; From backplane bus 5 V DC |
|---|
Show all 65 specifications ↓ Show less ↑60 more values in Identification, Power loss, Interfaces, Protocols, Interrupts/diagnostics/status information, Degree and class of protection, Standards, approvals, certificates, Ambient conditions, Dimensions, Weights, Logistics.
Identification 10
| Part number | 6ES7241-1CH32-0XB0 |
|---|---|
| Type designation | CM 1241 RS 422 / 485 |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 6940408102101 |
| ETIM class | EC001423 |
| eCl@ss | 27242208 |
Power loss 1
| Power loss, typ. | 1.1 W |
|---|
Interfaces 8
| Interfaces/bus type | RS 422 / 485 (X.27) |
|---|---|
| Number of interfaces | 1 |
| Point-to-point connection: Cable length, max. Integrated protocol driver | 1 000 m |
| Point-to-point connection: Freeport | Yes |
| Point-to-point connection: ASCII | Yes; Available as library function |
| Point-to-point connection: Modbus RTU master | Yes |
| Point-to-point connection: Modbus RTU device | Yes |
| Point-to-point connection: USS | Yes; Available as library function |
Protocols 7
| Integrated protocols Freeport: Telegram length, max. | 1 kbyte |
|---|---|
| Integrated protocols Freeport: Bits per character | 7 or 8 |
| Integrated protocols Freeport: Number of stop bits | 1 (Standard), 2 |
| Integrated protocols Freeport: Parity 3964 (R) | No parity (standard); even, uneven, mark (parity bit always 1); space (parity bit always 0) |
| Integrated protocols Freeport: Parity Modbus RTU master | No parity (standard); even, uneven, mark (parity bit always 1); space (parity bit always 0) |
| Integrated protocols Freeport: Address area | 1 through 49 999 (Standard Modbus addressing) |
| Integrated protocols Freeport: max. number of devices Modbus RTU device | 247; slave numbers 1 through 247, per MODBUS network segment maximum 32 devices, additional repeaters needed to expand the network to maximum configuration |
Interrupts/diagnostics/status information 2
| Diagnostics function | Yes |
|---|---|
| Diagnostics indication LED: for status of the outputs | Yes |
Degree and class of protection 1
| IP degree of protection | IP20 |
|---|
Standards, approvals, certificates 8
| CE mark | Yes |
|---|---|
| CSA approval | Yes |
| UL approval | Yes |
| cULus | Yes |
| FM approval | Yes |
| RCM (formerly C-TICK) | Yes |
| KC approval | Yes |
| Marine approval | Yes |
Ambient conditions 13
| Free fall: Fall height, max. | 0.3 m; five times, in product package |
|---|---|
| Ambient temperature during operation: min. | -20 °C |
| Ambient temperature during operation: max. | 60 °C |
| Ambient temperature during operation: horizontal installation, min. | -20 °C |
| Ambient temperature during operation: vertical installation, min. | -20 °C |
| Ambient temperature during operation: permissible temperature change | 5°C to 55°C, 3°C / minute |
| Ambient temperature during storage/transportation: min. | -40 °C |
| Ambient temperature during storage/transportation: max. | 70 °C |
| Air pressure acc. to IEC 60068-2-13: Operation, min. | 795 hPa |
| Air pressure acc. to IEC 60068-2-13: Operation, max. | 1 080 hPa |
| Air pressure acc. to IEC 60068-2-13: Storage/transport, min. | 660 hPa |
| Air pressure acc. to IEC 60068-2-13: Storage/transport, max. | 1 080 hPa |
| Relative humidity: Operation at 25 ℃ without condensation, max. | 95 % |
Dimensions 3
| Width | 30 mm |
|---|---|
| Height | 100 mm |
| Depth | 75 mm |
Weights 1
| Weight, approx. | 155 g |
|---|
Logistics 6
| Net weight | 0.15 kg |
|---|---|
| Country of origin | CN |
| Shipping weight | 0.65 kg |
| Ships from | Türkiye |
| Dispatch | 12 Nov |
| Stock | In stock |
Source: manufacturer data · Last verified: 01 Nov 2026
Documents
Documents for 6ES7241-1CH32-0XB0
No documents are on file for this part yet.
Ask us for the datasheet
Certifications
Certifications and standards
- CE mark
- CSA approval
- UL approval
- cULus
- FM approval
- RCM (formerly C-TICK)
- KC approval
- Marine approval
Quick answers
Questions about the CM 1241 RS 422 / 485
Which supply voltage is CM 1241 RS 422 / 485 rated for?
The rated operational voltage of CM 1241 RS 422 / 485 is 24 V AC.
What is the HS code of CM 1241 RS 422 / 485 for customs?
The tariff (HS) code on file for CM 1241 RS 422 / 485 is 85176200.
What is the EAN of CM 1241 RS 422 / 485?
The EAN (GTIN) of CM 1241 RS 422 / 485 is 6940408102101.
Where does CM 1241 RS 422 / 485 ship from, and how fast?
CM 1241 RS 422 / 485 ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival. Stock items are dispatched within 1–2 business days.
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Customer reviews
Series
Siemens SIMATIC S7-1200
- Brand
- Siemens
- Series
- SIMATIC S7-1200
