Modbus Variable Conversion in Enhanced IEC-61131
We've demonstrated Modbus RTU & Modbus TCP functionality in IEC-61131 before - it's a very popular video. In that session we gave you a ton of useful information - but we dealt strictly with Modbus integer (INT) data. Modbus devices often transmit DINT and REAL data values packed in a package of multiple integers. And with IEC's strict variable typing and Enhanced IEC's lack of an underlying memory structure - Modbus variable conversion needs to be solved. In this Livestream - we'll give you the tools you need to deal with this issue as elegantly as possible!
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Table of Contents:
00:00 - Introduction
01:09 - Chat with Casey
03:44 - Agenda
04:33 - Quick Modbus Review
05:20 - Modbus Data Model
06:15 - The Traditional Horner Modbus Server Implementation
07:01 - Standard IEC-61131 vs Enhanced IEC-61131 in Cscape
08:40 - Enhanced IEC Modbus Server Implementation
10:00 - What About Non-INT Data Types? i.e. (DINT, UDINT, REAL)
11:01 - 32-bit Data Types (DINT, UDINT, REAL) with Modbus & Enhanced IEC
11:58 - Using a UDFB to Split a 32-bit Variable
14:21 - Using a UDFB to Join a 32-bit Variable
15:11 - Demo - Modbus Conversion UDFBs
19:32 - Demo - Importing UDFBS into Enhanced IEC
21:49 - Wrap-Up