Precautions For System Configuration - Mitsubishi Electric MELSEC iQ-R Series Manual

2.3

Precautions for System Configuration

This section describes the precautions for the system configuration.
• For the module to be prepared for online module change, check the following in advance:
• The new module to be mounted has the same model name as the replacement target module.
• The firmware version of the mounted module supports the online module change.
• The new module to be mounted has no failure.
• In the multiple CPU system, when any of the CPU modules is set to "Enable" in "Direct change setting" (including the case
where other CPU modules are set to "Disable" in "Direct change setting"), there is a possible error where the operation of
all the CPU modules does not stop but continue ( Page 43 When "Direct change setting" is set to "Enable"). When
configuring a system, verify that the system is not affected if the operation continues in spite of the error.
• For the external power supply of the module on which online module change is to be performed, and the power supply of
external devices, provide a means of turning off the power separately with a switch or other devices to prevent an electric
shock or malfunction of the module in operation.
• The recommendation before the checks listed below is to perform online module change in advance on the actual system
to verify that there is no influence on the operation of the modules that are not subject to replacement.
• There is no error in the means of turning off the connection to external devices, and its system configuration.
• There is no influence caused by turning on or off a switch or other devices.
• An instruction that accesses the replacement target module (for example, the FROM instruction) may cause malfunction of
the module during the online module change. Add an interlock as needed. The following shows how to provide an interlock
with a module accessed by the FROM instruction in the event of online module change.
Ex.
An interlock to stop the FROM instruction to the target module when the online module change is performed on the target
module while the FROM instruction is being executed to the module whose start I/O number is 0010H.
Interlock part
I/O No. of the module
being changed online
<> K1 SD1602
Online module change
progress status
> K3 SD1617
 Establishing the following two conditions results in the stop of the FROM instruction given to the module whose start I/O number is 0010H:
• When 1 is stored in 'Online module changing module I/O No.' (SD1602)
• When 3 (Module removal in preparation) or a larger value is stored in 'Online module changing status' (SD1617) (3 or a larger value is stored until the control
of the module restarts from the state where module removal is allowed.)
 An interlock is provided as well in the processing that is affected by the data of the FROM instruction.
FROM H1 K0 D100 K1
Processing affected by data set with FROM
INC D100
= D100 K1
Ò
Ó
Y0
2 SYSTEM CONFIGURATION
2.3 Precautions for System Configuration
2
11