Mitsubishi Q2ACPU User Manual

9.
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MAINTENANCE FUNCTION
9.7 Online I/O Module Replacement
When an I/O module is installed or removed while the QnACPU power is ON, "UNIT
VERIFY ERROR" appears, and PLC CPU operation stops or control is kept with I/O
numbers that are different from the set numbers.
Replacing the I/O module during online is the replacement method that replaces the I/O
module without "UNIT VERIFY ERROR" while the PLC CPU power is ON.
(1) Application
Replacing I/O modules during online is used to replace an I/O module at which an
error has occurred while continuing control by the sequence program.
(2) Replacement method
The following two methods can be used to replace an I/O module during online.
(a) Use "Connect Unit" in the PLC menu in the GPP function PLC diagnostics mode.
(b) Use special relays/special registers.
(3) Procedure when using GPP function
(a) Designate the I/O module to be replaced with "Connect Unit" of the PLC menu in
the PLC diagnostics mode.
(b) Replace the designated I/O module.
CAUTION
Basically, replace I/O modules after turning off the power supply.
When replacing I/O modules during online using the function in this section, perform
it according to the user system specification.
POINT
Replaceing I/O modules during online is possible only for I/O module.
This is not applied to special function modules.
Fig. 9.2 Replacing input modules during online

Mitsubishi Q2ACPU Specifications

General

Brand	Mitsubishi
Model	Q2ACPU
Category	Controller
Language	English