SIMATIC S7-1500 6ES7550-1AA01-0AB0 TM Counter Module 2 Channels

Manufacturer	Siemens
Part Number	6ES7550-1AA01-0AB0
Product Type	PLC Module

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Description
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Overview

6ES7550-1AA01-0AB0 is a SIMATIC S7-1500 TM count 2x 24 V counter module，Processes up to 1 MHz encoder signals，Up/down, quadrature (A/B phase), pulse/direction, single pulse， Frequency (0.1 Hz to 1 MHz), speed, and time period calculation。

Specification

Item	Value
Module Type	TM Count 2x24V (S7-1500 Technology Module)
Function	2 independent high-speed counter channels for 24V incremental/pulse encoders
Digital I/O per Channel	3 DI (for gating, direction, reset)+2 DQ (for compare, status)
Max Input Frequency	Up to 1 MHz per channel (A/B phase encoder)
Counter Range	32-bit (0 to 4,294,967,295 or -2,147,483,648 to 2,147,483,647)
Measurement Capabilities	Frequency, speed, time period, position measurement
Isolation	Channel-to-channel and channel-to-backplane electrical isolation
Power Supply	24VDC (19.2-28.8VDC), max 1.5A
Firmware	V2.0 (field-upgradable)
Safety Rating	SIL 2 / PL d (for safety-related applications)
Dimensions	35mm width (standard S7-1500 module)

FAQ:

1.What is the terminal assignment of the X1/X2 connector of the 6ES7550-1AA01-0AB0?

6ES7550-1AA01-0AB0 (TM Count 2x24V) has X1 as the 40-pin front connector (signal) and X2 as the 4-pin power connector (power supply).

X1（40‑Pin Front Connector，Signal）:

Pin No.	Signal Name	Channel	Function Description
1	CH0_A	Channel 0	Encoder channel A (input, 24VDC)
2	CH0_B	Channel 0	Encoder channel B (input, 24VDC)
3	CH0_Z	Channel 0	Encoder zero mark Z (input, 24VDC)
4	CH0_GATE	Channel 0	Hardware gating input (DI, 24VDC)
5	CH0_DIR	Channel 0	Direction control input (DI, 24VDC)
6	CH0_RST	Channel 0	Reset input (DI, 24VDC)
7	CH0_DQ0	Channel 0	Compare output 0 (DQ, 24VDC transistor)
8	CH0_DQ1	Channel 0	Compare output 1 (DQ, 24VDC transistor)
9	24VDC	—	Encoder/sensor 24VDC supply (internal, short‑circuit/overload protected)
10	M	—	Reference ground for 24VDC (pin 9)
11	CH1_A	Channel 1	Encoder channel A (input, 24VDC)
12	CH1_B	Channel 1	Encoder channel B (input, 24VDC)
13	CH1_Z	Channel 1	Encoder zero mark Z (input, 24VDC)
14	CH1_GATE	Channel 1	Hardware gating input (DI, 24VDC)
15	CH1_DIR	Channel 1	Direction control input (DI, 24VDC)
16	CH1_RST	Channel 1	Reset input (DI, 24VDC)
17	CH1_DQ0	Channel 1	Compare output 0 (DQ, 24VDC transistor)
18	CH1_DQ1	Channel 1	Compare output 1 (DQ, 24VDC transistor)
19–40	—	—	Not used (reserved)

X2（4‑Pin Power Connector，Supply）:

Pin No.	Signal Name	Function Description
41	L+	Module 24VDC power input (reverse polarity protected)
42	L+	Power pass‑through for next module
43	M	Power pass‑through for next module
44	M	Reference ground for 24VDC (pin 41)

2.Can 6ES7550-1AA01-0AB0 be used properly in an ET 200MP station?

6ES7550-1AA01-0AB0 can be used normally in the ET 200MP station:

Compatible with IM 155-5 series PN interface modules (ST/HF/TF), directly installed in the ET 200MP I/O slot;
Supports PROFINET communication, choose IM 155-5 PN HF/TF for better real-time performance, Fast Mode is suitable for high-speed acquisition;
The local/distributed configuration is consistent, configured through TIA Portal (V15+), and supports online diagnosis and firmware upgrade;
Powered by the ET 200MP backplane bus, X1 pin9 can independently supply 24VDC to the encoder;
Note: The firmware version needs to match the interface module. Parameter changes and counting ranges are limited in Fast Mode. The encoder cable is recommended to be ≤50 meters and well shielded.