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Goals and Symptoms
To explain users the offset inconsistent issue across different PLC platforms when using Unity Pro software to configure I/O scanner table.
Facts and Changes
Due to the historic heritage reason, The Quantum product line including NOE77100/10/01/11, Quantum Copro 140CPU65150/60 do not support address %mw0 (or 400000). But Premium, M340 product line support address %MW0. So Unity Pro software allows users to put Read/Write index 0 for slave index in case the slave device is a Premium or M340 PRODUCTS.
The consequence is that using Unity Pro software, if the remote slave device is a Quantum product, the Read and Write index number will be increased by 1. If the remote slave device is Premium or M340 product, there is no offset by one.
Several I/O scanner configuration examples are used below for explaining this issue.
· Example 1: NOE77101 I/O scanner configuration table using Concept software
Causes and Fixes
Schneider Electric current has no plan to fix this issue because we dont want the large existing customers to change their application if they download the new firmware with the offset change.