PLC Handshake Standard

Introduction

This standard defines the PLC-to-PLC / PLC-to-machine handshake method for reliable automatic operation, fault handling, and safe data transfer in industrial systems. It is verified by many projects, and can be used for small automation cells and large prouction lines.

Interactions Notes:

• Blue Lines = Sequence in step
• Orange Line = Sequence NOT in step

Inter Sequence Handshaking

When handshaking between sequences of the same station, the system uses a main sequence/sub sequence model. There are generally 2 types of applications for using sub sequences.

1. Synchronous: The main sequence must wait for the sub sequence to complete before continuing past a point.
2. Asynchronous: The main sequence does not need the sub sequence to complete.

Asynchronous

This document includes:

• General PLC handshake standard for real-world projects
• Inter Sequence Handshaking
• Inter Machine Handshaking