Product Overview
Applications
Supports continuous counting, hardware or software gates, event-controlled stopping, synchronization via digital input and parameterizable counting ranges.
Supports incremental and absolute acquisition and is suitable for S7-1500 Motion Control.
Supports frequency, cycle duration and velocity measurement with parameterizable measuring time and dynamic measurement period adjustment.
Technical Summary
| Product type | TM PosInput 2 |
|---|---|
| Encoder signals | RS-422 incremental encoder; SSI absolute encoder |
| Number of channels | 2 |
| Digital inputs | 4; 2 per channel |
| Digital outputs | 4 transistor outputs; 2 per channel |
| Counting frequency, max. | 4 MHz; with quadruple evaluation |
| SSI clock frequency, max. | 2 MHz |
| Load voltage L+ | 24 V DC; permissible range 19.2 V to 28.8 V |
| Mounting | S7-1500 mounting rail |
| Engineering | STEP 7 TIA Portal configurable/integrated from V17 |
Key Features
Supports RS-422 incremental encoders and SSI absolute encoders; TTL 5 V is supported for push-pull encoders only.
Has 2 channels, 4 digital inputs total and 4 transistor digital outputs total; 2 inputs and 2 outputs per channel.
Provides 2 counters with a maximum counting frequency of 4 MHz with quadruple evaluation.
Supports parameterizable telegram lengths from 10 … 40 bit and clock frequencies up to 2 MHz.
Load voltage is 24 V DC with a permissible range of 19.2 V to 28.8 V; rail mounting on an S7-1500 mounting rail.
Configurable/integrated with STEP 7 TIA Portal from V17; supports diagnostic alarms, hardware interrupts and channel diagnostics.
Frequently Asked Questions
What exact configuration does Siemens 6ES7551-1AB01-0AB0 provide?
It is a TM PosInput 2 module with 2 channels for RS-422 incremental or SSI absolute encoders, 4 digital inputs and 4 transistor digital outputs.
What encoder signal types are supported?
It supports symmetrical RS-422 incremental encoders, 5 V TTL push-pull incremental encoders and SSI absolute encoders with RS-422 input signals.
What are the counting and SSI limits?
The maximum counting frequency is 4 MHz with quadruple evaluation. SSI telegram length is parameterizable from 10 … 40 bit, with a maximum clock frequency of 2 MHz.
How is the module mounted and supplied?
It uses S7-1500 rail mounting and a 24 V DC load voltage with a permissible range of 19.2 V to 28.8 V.
What project details should accompany a quotation request?
Include the requested quantity, destination, schedule context and any additional BOM lines.
