Compatibility between a Premium PLC and a Series 1000 PLC

At a Glance

Using READ_VAR and WRITE_VAR functions enables you to read and write objects contained in series 1000 PLCs. These can be words, double words, floating points, or character strings.

Memory Addressing

The address of the object in the series 1000 PLC memory determines the type of object to be accessed.

This table presents the access addresses for an APRIL 5000 PLC from the series 1000 range, with memory extension.

Variable Type	April 5000 with Extension
Variable Type	PLC Address	Access Address (in Hex.)
Internal bits %M	%M0 %M4095	A000 AFFF
Data words %MW	%MW0 %MW24999	0 61A7
Data words %MD	%MD25000 %MD26998	61A8 6976
Data words %FD	%FD27000 %FD28998	6978 7146
Data words %CH	%CH29000 %CH43903	7148 AB7F

Programming Rules

When you want to access the objects of a series 1000 PLC, the index of the first object to read (or write) is the access address.

Example:

Read the bit %M0.

READ_VAR(ADDR('0.0.1.3'), '%M', 16#A000, 1, ...)
Read the word %MD25000.

READ_VAR(ADDR('0.0.1.3'), '%MW', 16#61A8, 2, ...)

Furthermore, these communication functions do not allow you to exchange double words or character strings using Modbus protocol. Where necessary, the transfer can be made in %MW form. Here, the project is in charge of the direction of the word ranking.

The diagnostics functions can be accessed using the SEND_REQ function.

Compatibility between a Premium PLC and a Quantum PLC or Micrologic Device

Descriptive table:

Premium	Quantum	Micrologic
%M0	00001	%M1
%MW0	40001	%MW1