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The 6ES5256-3AB21 connects SIMATIC S5 controllers to external operator panels. This interface module handles data exchange between the PLC and HMI devices. You can rely on it for reliable operator control and monitoring tasks.
Key Technical Parameters
The table below lists all essential technical specifications for this interface module.
| Specification | Details |
|---|---|
| Part Number | 6ES5256-3AB21 |
| Product Type | Interface Module |
| Compatibility | SIMATIC S5 PLC systems |
| Communication Ports | 1 serial interface |
| Port Type | RS-232 (9-pin D-sub) |
| Transmission Rate | 300 bps to 19.2 kbps |
| Protocol Support | AS511 (point-to-point) |
| Maximum Cable Length | 15 meters |
| Buffer Memory | 4 KB FIFO |
| Dimensions (W x H x D) | 250 mm x 25 mm x 210 mm |
| Weight | Approx. 0.48 kg |
| Connector Type | 9-pin D-sub (female) |
| Power Supply | 5V DC from backplane |
| Current Consumption | 150 mA |
| Operating Temperature | 0°C to 55°C |
Physical Characteristics and Installation
This interface module weighs approximately 0.48 kg for standard rack mounting. Its dimensions measure 250 mm x 25 mm x 210 mm for S5 single-width slots. First, slide the 6ES5256-3AB21 into a free I/O rack position. Then, connect your operator panel to the 9-pin D-sub port. Finally, secure the module using the top and bottom locking screws. LED indicators on the front show power and communication activity.
Communication Specifications
The 6ES5256-3AB21 provides one RS-232 serial port for HMI connectivity. This interface supports the AS511 point-to-point protocol for Siemens devices. The transmission rate ranges from 300 bps up to 19.2 kbps. Maximum cable length reaches 15 meters for flexible panel placement. A 4 KB FIFO buffer prevents data loss during communication bursts.
Power Requirements and Compatibility
This interface module draws 150 mA from the 5V DC backplane supply. The 6ES5256-3AB21 works with Siemens OP and TP series operator panels. You can also connect third-party serial devices using the AS511 protocol. The module handles all handshaking and error checking automatically. Use this interface for local machine control and status display applications.