The Siemens 6ES7541-1AB00-0AB0 is a CM PtP RS422/485 HF communication module for the SIMATIC S7-1500 and ET 200MP systems, designed for high-performance point-to-point serial communication. It features a short-circuit-proof, electrically isolated RS422/485 interface supporting transmission rates from 300 bps to 115.2 kbps, and is compatible with Freeport, 3964(R), USS, and Modbus RTU protocols.
Item No :
6ES7541-1AB00-0AB0Order(MOQ) :
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3~5 daysWeight :
3kg| Specification | Description |
|---|---|
| Manufacturer | Siemens |
| Model | 6ES7541-1AB00-0AB0 |
| Product Family | SIMATIC S7-1500 / ET 200MP |
| Product Type | Point-to-Point Communication Module (High Feature) |
| Interface | RS422 / RS485 (15-pin Sub-D socket) |
| Transmission Rate | 300 bps to 115.2 kbps |
| Protocols | Freeport, 3964(R), USS, Modbus RTU (Master/Slave) |
| Max Frame Length | 4 kbyte |
| Modbus Slave Addresses | 1 to 247 (extended 1 to 65,535) |
| Cable Length (RS485) | Max. 1,200 m |
| Power Supply | Via backplane bus (43 mA rated) |
| Power Loss | Typ. 0.6 W |
| Isolation | Between backplane bus and interface |
| Diagnostic LEDs | RUN (green), ERROR (red), MAINT, TxD, RxD |
| Mounting | S7-1500 mounting rail |
| Weight | Approx. 0.25 kg |
| Country of Origin | Germany (DE) |
| Lifecycle Status | Active |
| Model | Description | Typical Application |
|---|---|---|
| 6ES7541-1AB00-0AB0 (this model) | CM PtP RS422/485 HF, 115.2 kbps, Modbus RTU | Standard serial communication with S7-1500 |
| 6ES7541-1AB01-0AB0 | Enhanced version, 250 kbps, updated firmware features | Higher-speed serial applications |
| 6ES7540-1AB00-0AA0 | CM PtP RS422/485 BA (Basic), no Modbus RTU | Cost-sensitive serial applications |
| 6ES7540-1AD00-0AA0 | CM PtP RS232 BA (Basic), RS232 interface | RS232 serial communication |
| 6ES7541-1AD00-0AB0 | CM PtP RS232 HF, RS232 with Modbus RTU | High-feature RS232 applications |
| 6ES7902-3AB00-0AA0 | Connecting cable, 5 m, 15-pin Sub-D | Required for field device connection |
| 6ES7902-3AC00-0AA0 | Connecting cable, 10 m, 15-pin Sub-D | Longer distance connections |
Q1: What protocols does the 6ES7541-1AB00-0AB0 support?
The module supports Freeport (ASCII), 3964(R), USS, and Modbus RTU (both Master and Slave) protocols . This makes it compatible with a wide range of third-party devices, including drives, sensors, and legacy controllers.
Q2: How is this module powered?
The module is powered via the backplane bus — no separate 24V DC power connection is required . It draws a rated current of 43 mA from the S7-1500 backplane.
Q3: What is the maximum transmission rate of this module?
The maximum transmission rate is 115.2 kbps . For higher speeds up to 250 kbps, the 6ES7541-1AB01-0AB0 variant is recommended .
Q4: What software is required to configure this module?
The module is configured using STEP 7 TIA Portal V12 or higher, or STEP 7 V5.5 SP2 with GSD file for non-Siemens systems . Programming uses dedicated instructions such as Send_P2P, Receive_P2P, and Modbus_Comm_Load .
Q5: Can this module be used for Modbus RTU communication?
Yes. The module supports Modbus RTU Master and Slave modes, with slave addresses from 1 to 247 (extended to 65,535) and up to 32 devices in a multi-drop configuration . It is commonly used for connecting S7-1500 PLCs to Modbus-based drives, power meters, and other field devices.
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