Siemens 6ES7550-1AA00-0AB0 SIMATIC S7-1500 TM Count 2x24V Technology Module

Overview

yeSIEMENS SIMATIC S7-1500

6ES7550-1AA00-0AB0 SIMATIC S7-1500 TM Count 2x24V Technology Module

Two-channel technology module for 24 V incremental encoders and pulse sensors, with counter comparison functions, digital gating and motion-control position acquisition.

At a Glance

Brand	Siemens
Model	6ES7550-1AA00-0AB0
Product Type	TM Count 2x24V technology module
Core Function	High-speed counting and position measurement
Application	S7-1500 and ET 200MP automation systems

Two counter channels

Acquire pulse and incremental encoder signals independently.

Local control signals

Three digital inputs and two digital outputs are available per channel.

Position acquisition

Integrate incremental position values into S7-1500 Motion Control.

Product Overview

6ES7550-1AA00-0AB0 provides two 24 V counter channels for pulse counting, frequency measurement and incremental position acquisition in a SIMATIC S7-1500 or ET 200MP station.

The module accepts source or sink encoder signals, includes digital inputs for gate, capture and synchronization functions, and can switch outputs from comparison values.

Ordering focus: Match the 24 V encoder signal type, input frequency, evaluation mode and cable length, then select the required counting, measurement or position-input configuration.

Key Functions

Encoder counting

A/B incremental tracks, zero tracks and pulse encoders are supported, with up to 200 kHz input frequency and 800 kHz counting with quadruple evaluation.

Gate and comparison control

Hardware and software gates, capture, synchronization and two comparators per channel coordinate counting with the machine process.

Measurement and Motion Control

The module measures frequency and cycle duration and supports incremental position acquisition for S7-1500 Motion Control.

Official Specifications

Counter channels	2
Maximum encoder input frequency	200 kHz
Maximum counting frequency	800 kHz with quadruple evaluation
Encoder signal level	24 V; source or sink inputs
Digital control inputs	6 total; 3 per channel
Digital outputs	4 transistor outputs; 2 per channel
Rated output current	0.5 A per output; 2 A maximum per module
Comparators	2 per channel
Load supply voltage	24 V DC; permissible range 19.2–28.8 V
Maximum no-load current	75 mA
Common encoder supply	L+ minus 0.8 V; 1 A maximum total for both channels
Typical power loss	4 W
Per-channel input address area	16 bytes
Per-channel output address area	12 bytes; 4 bytes for Motion Control
Shielded encoder cable length	Up to 600 m depending on frequency and cable quality; maximum 50 m at 200 kHz
Minimum isochronous bus cycle	250 µs
Frequency measurement range	0.04 Hz–800 kHz
Cycle-duration measurement range	1.25 µs–25 s

Official source:Siemens product manual and technical specifications

Frequently Asked Questions

Can I connect a 5 V RS422 encoder directly to 6ES7550-1AA00-0AB0?

This version is intended for 24 V source or sink encoder signals.

Does 6ES7550-1AA00-0AB0 support Local control signals for mobile equipment?

A 200 kHz incremental input reaches 800 kHz counting through quadruple signal evaluation.

How far can the encoder cable run at full speed on 6ES7550-1AA00-0AB0?

At a 200 kHz input frequency, the maximum shielded encoder cable length is 50 m.

Can I stop and start the count using a sensor connected to 6ES7550-1AA00-0AB0?

A digital input can act as a hardware gate and software gating is also available.

Can 6ES7550-1AA00-0AB0 switch an output when the count reaches a setpoint?

Two comparators per channel can trigger the parameterizable digital outputs from comparison values.

How much encoder-supply current can I draw from 6ES7550-1AA00-0AB0?

The common 24 V encoder supply allows a maximum combined current of 1 A across both channels.

Can I use 6ES7550-1AA00-0AB0 for an S7-1500 motion axis?

Incremental position acquisition is supported for S7-1500 Motion Control.

Compatibility & Ordering Notes

Before ordering 6ES7550-1AA00-0AB0: Choose this 24 V counting module for compatible encoder outputs and the intended counting or Motion Control mode, including the required front connector and station components.

Compatibility Checklist for 6ES7550-1AA00-0AB0

• Keep 24 V encoder wiring distinct from 5 V RS422 or SSI interfaces.
• Apply the frequency-dependent encoder cable length limit, including 50 m at 200 kHz.
• Budget the common encoder supply for both channels together.
• Allocate the per-channel address areas for the chosen technology operating mode.

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