Product information
Overview
Applications
- Pulse and incremental encoder counting: Supports pulse and incremental encoders for counting, hardware or software gating, synchronization via digital input, and TO High_Speed_Counter use.
- Incremental and absolute position acquisition: Supports incremental acquisition and absolute acquisition for position detection, including S7-1500 Motion Control.
- Frequency and cycle duration measurement: Provides parameterizable frequency measurement from 0.04 Hz to 4 MHz and cycle duration measurement from 0.25 μs to 25 s.
Key Features
- Counter and position detection: Provides 2 counters, incremental and absolute acquisition, parameterizable counting range, continuous counting, and event-controlled stop.
- Encoder interfaces: Supports RS-422 incremental encoder signals up to 1 MHz input frequency and SSI absolute encoders with 10 … 40 bit telegram length.
- Counting performance: Counting frequency reaches 4 MHz with quadruple evaluation; frequency measurement range is 0.04 Hz to 4 MHz.
- Digital I/O: Has 4 parameterizable digital inputs and 4 transistor digital outputs, with 2 inputs and 2 outputs per channel.
- Supply and protection: Uses a rated 24 V DC load voltage with a permissible range of 19.2 V to 28.8 V, reverse polarity protection, and encoder supply short-circuit protection.
- Mounting and diagnostics: Supports S7-1500 mounting rail installation and provides diagnostic alarm, hardware interrupt, RUN, ERROR, MAINT, PWR, channel status, and channel diagnostic LEDs.
Technical Summary
| Product type | TM PosInput 2 |
|---|---|
| Number of channels | 2 |
| Encoder types | RS-422 incremental encoder; SSI absolute encoder |
| Digital inputs | 4; 2 per channel |
| Digital outputs | 4; 2 per channel |
| Load voltage | 24 V DC rated; permissible range 19.2 V to 28.8 V |
| Maximum counting frequency | 4 MHz; with quadruple evaluation |
| Input frequency, max. | 1 MHz |
| Mounting | S7-1500 mounting rail |
Frequently Asked Questions
What is the exact product type of Siemens 6ES7551-1AB01-0AB0?
It is a SIMATIC S7-1500 TM PosInput 2 counter and position detection module.
How many channels and digital I/O points does the module have?
It has 2 channels, with 2 digital inputs and 2 digital outputs per channel.
Which encoder signals are supported?
It supports RS-422 incremental encoder signals and SSI absolute encoder signals. TTL 5 V is supported for push-pull encoders only.
What mounting and supply details should be verified?
It supports S7-1500 mounting rail installation and uses 24 V DC rated load voltage within a permissible range of 19.2 V to 28.8 V.
