M580 Hot Standby (non Safety) : How to complete offline modification with allowed application mismatch i.e. without taking the system down

Issue :

On a M580 Hot Standby system (non safety), how can I complete some modifications that require to be offline without having to take the whole control system down?

Product Line :

M580 Hot Standby (non safety)

Control Expert (formerly Unity Pro)

Environment :

M580 firmware v2.80 and greater

Unity Pro V12 and greater

All versions of Control Expert

Resolution :

The procedure presented here can be found in the Control Expert help file in the following place:

Modicon M580 Platform -> Configuring the Controller in Control Expert -> Working with M580 Hot Standby System -> Offline Application Modification with Allowed Application Mismatch

The following setting is mandatory for this procedure to work

STEP 1

In this example we have only the first section of the code that is executed by both the Primary and Standby, so the block was added to the first section.

This is a modification that can be done online on the system. Just be sure that both the Primary and Standby are equal when you are done.

STEP 2

STEP 3

STEP 4

STEPS 5,6 and 7

For this example, a Modbus device will be added in the DTM browser.

NOTE : only offline modification that can be built using "Build Changes" should be attempted. Any modifications requiring a "Rebuild All" might not work with this procedure and will require taking the system down to apply.

Original project:

Project with new Modbus device added

STEP 8 and 9

STEP 10

STEP 11

STEP 12 will be skipped as it is about M580 safety system

STEP 13 and 14

STEP 15

Depending on how you were connected to the CPU (USB or Ethernet), you might need to move the USB cable to the new primary or connect to another IP address.

STEP 16 and 17

The hot standby variable will be used in this example to complete those steps.

First the transfer command

Then the RUN command

STEP 18

Procedure is complete

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