Product Overview
Technical Summary
| Parameter | Value |
|---|---|
| Module type | TM PosInput 2 |
| Encoder support | RS-422 incremental encoder or SSI absolute encoder |
| Channels | 2 |
| Digital I/O | 2 digital inputs and 2 transistor digital outputs per channel |
| Load voltage | 24 V DC; permissible range 19.2 V to 28.8 V |
| Incremental input frequency | Up to 1 MHz |
| Counting frequency | Up to 4 MHz with quadruple evaluation |
| SSI clock frequency | Up to 2 MHz |
| Mounting | S7-1500 mounting rail |
Applications
- Position detection: Performs incremental and absolute position acquisition.
- Encoder counting: Counts pulse and incremental encoder signals with continuous counting, hardware or software gates, event-controlled stop, and synchronization via digital input.
- Measurement functions: Supports frequency, cycle duration, and velocity measurement with parameterizable measuring time.
Key Features
- Encoder and counter function: Supports RS-422 incremental encoders and SSI absolute encoders, with 2 integrated counters and position detection for incremental and absolute acquisition.
- Channels and digital I/O: Provides 2 channels, 2 digital inputs per channel, and 2 transistor digital outputs per channel.
- Encoder interfaces: Supports RS 422 and TTL 5 V interfaces; TTL 5 V is for push-pull encoders only. SSI telegram length is parameterizable from 10 … 40 bit.
- Encoder signal performance: Incremental encoder input frequency is up to 1 MHz and counting frequency is up to 4 MHz with quadruple evaluation. SSI clock frequency is up to 2 MHz.
- Supply and protection: Uses 24 V DC load voltage with a permissible range of 19.2 V to 28.8 V, reverse polarity protection, and short-circuit-protected encoder supplies.
- Installation and diagnostics: Mounts on an S7-1500 mounting rail and provides diagnostic alarm, hardware interrupt, supply-voltage monitoring, wire-break, short-circuit, A/B transition, and SSI telegram diagnostics.
Frequently Asked Questions
1. What encoder types does Siemens 6ES7551-1AB00-0AB0 support?
It supports RS-422 incremental encoders and SSI absolute encoders. It also supports TTL 5 V for push-pull encoders only.
2. How many channels and digital I/O points does the module have?
It has 2 channels, with 2 digital inputs and 2 transistor digital outputs per channel.
3. What are the encoder frequency limits?
Incremental encoder input frequency is up to 1 MHz, counting frequency is up to 4 MHz with quadruple evaluation, and SSI clock frequency is up to 2 MHz.
4. How is the module installed and powered?
It mounts on an S7-1500 mounting rail and uses 24 V DC load voltage within 19.2 V to 28.8 V.
