Name: Siemens 6ES7288-5CM01-0AA0 SB CM01 RS485/RS232 Communication Board
Brand: SIEMENS
SKU: 2927073
Price: 1 USD
Availability: InStock

Product Overview

Siemens 6ES7288-5CM01-0AA0 is the SB CM01 RS485/RS232 communication board for the SIMATIC S7-200 SMART family. It occupies the CPU signal-board position and adds a serial communication interface without changing the expansion-module channel count.

At the board connector, Siemens 6ES7288-5CM01-0AA0 exposes the X20 terminal map for functional earth, Tx/B, RTS, M, Rx/A and a 5 V bias-voltage output. The same terminal group supports the RS485 or RS232 signal path selected by the connected system wiring.

For installation planning, Siemens 6ES7288-5CM01-0AA0 is a 35 × 52.2 × 16 mm, 18.2 g board with 0.5 W power dissipation and 50 mA current consumption from the 5 V DC signal-board supply. Its documented cable limits and non-isolated signal reference must be considered at the control-panel design stage.

Siemens 6ES7288-5CM01-0AA0 SB CM01 RS485 RS232 X20 wiring diagram

Technical Information

Technical item	Specification
Brand	Siemens
Model	6ES7288-5CM01-0AA0
Product name	SB CM01 RS485/RS232 communication board
Country	Germany (Siemens manufacturer identity)
Product family	SIMATIC S7-200 SMART signal board
Board dimensions (W × H × D)	35 × 52.2 × 16 mm
Weight	18.2 g
Power dissipation	0.5 W
Current consumption	50 mA at 5 V DC; 24 V DC: N/A
External connector	X20, 6-pin terminal connection
X20 pin order	1 Functional Earth · 2 Tx/B · 3 RTS · 4 M · 5 Rx/A · 6 5 V Out (bias voltage)
RS485 common-mode range	−7 to +12 V for 1 s; 3 VRMS continuous
Shielded RS485 cable length	50 m without isolated repeater; 1000 m up to 187.5 kbps with isolated repeater
Shielded RS232 cable length	10 m maximum
Signal isolation	None to chassis ground and CPU logic common

Communication & Connectivity

Siemens 6ES7288-5CM01-0AA0 places the serial field connection at the CPU signal-board position. The X20 terminal group separates the two differential/data conductors, the RTS control lead, the common reference and the bias-voltage output so the external wiring can be identified before commissioning.

RS485 pair

On Siemens 6ES7288-5CM01-0AA0, Tx/B and Rx/A are the two named RS485 signal conductors at X20. The shielded link can extend to 50 m without an isolated repeater, or to the documented 1000 m limit when the isolated-repeater condition and 187.5 kbps ceiling apply.

RS232 route

The RS232 wiring for Siemens 6ES7288-5CM01-0AA0 uses the transmit, receive and common references from the X20 group. Its shielded cable limit is 10 m, keeping the point-to-point serial connection separate from the longer RS485 arrangement.

X20 termination

Connector X20 on Siemens 6ES7288-5CM01-0AA0 assigns pin 1 to functional earth, pin 3 to RTS and pin 6 to the 5 V bias output. This order gives the installer a direct terminal-by-terminal map instead of an unlabeled serial cable bundle.

Operating Characteristics

Siemens 6ES7288-5CM01-0AA0 has separate electrical limits for its RS485 and RS232 modes. The values below explain how line loading, threshold behavior, cable length and grounding affect the usable serial path; they are not a second copy of the identification table.

Differential drive

For Siemens 6ES7288-5CM01-0AA0, the RS485 transmitter provides at least 2 V differential output into 100 Ω, or at least 1.5 V into 54 Ω. The receiver input impedance is at least 12 kΩ, keeping the stated line load distinct from the transmitter test load.

Threshold response

The RS485 receiver in Siemens 6ES7288-5CM01-0AA0 has a minimum ±0.2 V threshold with 60 mV typical hysteresis. The RS232 receiver uses a 0.8 V low threshold, a 2.4 V high threshold and 0.5 V typical hysteresis.

Reference and reach

Signal isolation is not provided by Siemens 6ES7288-5CM01-0AA0 between the serial signal and chassis ground or CPU logic common. The system designer therefore uses the documented cable distances and the specified reference wiring rather than treating the board as an isolated repeater.

Questions About This Product

Which terminals should be identified first when wiring Siemens 6ES7288-5CM01-0AA0?

Start with the X20 order on Siemens 6ES7288-5CM01-0AA0: functional earth, Tx/B, RTS, M, Rx/A and 5 V Out. Confirming this sequence prevents a serial cable from being landed with the transmit and receive conductors shifted.

Can Siemens 6ES7288-5CM01-0AA0 use the same cable distance for RS485 and RS232?

No. Siemens 6ES7288-5CM01-0AA0 documents 10 m maximum for shielded RS232, while RS485 is 50 m without an isolated repeater or up to 1000 m under the stated isolated-repeater condition.

What should be checked if a Siemens 6ES7288-5CM01-0AA0 link is unstable near a panel ground?

Check the reference and isolation boundary of Siemens 6ES7288-5CM01-0AA0. The serial signals are not isolated from chassis ground or CPU logic common, so the X20 functional-earth and common wiring must match the intended installation.

Does Siemens 6ES7288-5CM01-0AA0 require a separate 24 V supply?

The documented board current is 50 mA from 5 V DC, while the 24 V DC current entry is N/A for Siemens 6ES7288-5CM01-0AA0. Do not assign a 24 V feed to the signal-board supply based on the serial field voltage alone.

How can a technician distinguish the RS485 path on Siemens 6ES7288-5CM01-0AA0?

Use the X20 labels Tx/B and Rx/A on Siemens 6ES7288-5CM01-0AA0, then check the expected differential behavior and common-mode range. A cable marked only by generic TX/RX names should be traced back to these board labels before energizing.

What physical clearance should be reserved for Siemens 6ES7288-5CM01-0AA0?

Allow for the 35 × 52.2 × 16 mm envelope of Siemens 6ES7288-5CM01-0AA0 at the CPU signal-board position, plus the bend and termination space needed around X20. The board itself is 18.2 g, so the connector and cable path remain the practical installation concern.

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Product Name	Siemens 6ES7288-5CM01-0AA0 SB CM01 RS485/RS232 Communication Board
Item NO.	2927073
Weight	0.1 kg = 0.2205 lb = 3.5274 oz
Category	SIEMENS
Brand	SIEMENS
Creation Time	2026-10-25

Siemens 6ES7288-5CM01-0AA0 SB CM01 RS485/RS232 Communication Board Item NO.: 2927073