6
FUNCTIONS
6.11 Monitor Function
6.11.3 Forced ON/OFF for external I/O
6 - 65
1
Overview
2
Performance
Specification
3
Sequence Program
Configuration and
Execution Conditions
4
I/O Nunber Assignment
5
Memories and Files
Handled by CPU Module
6
Functions
7
Communication using
built-in Ethernet ports of
CPU module
8
Communication with
Intelligent Function
Module
(4) Precautions for using the Redundant CPU
(a) Systems to be registered/canceled
When the Redundant CPU is used, register/cancel the enforced I/O for the control
system. (Enforced I/O cannot be registered/canceled for the control system and
standby system individually.)
After system switching, register/cancel the enforced I/O for the new control
system (system that was changed from the standby system to the control system
by system switching).
An error (error code: 4240
H) will occur if the enforced I/O is registered/canceled
for the standby system.
(b) Power OFF to ON or reset in separate mode
When the control system is powered OFF or reset in the separate mode, the
registered enforced I/O is canceled.
The operation performed after cancel is the same as the operation indicated in
"During canceling (no operations)" in Table6.18.
However, the output of the module on the MELSECNET/H remote I/O station is
processed as described below.
1) During power OFF or reset
The output status at power OFF or reset of the control system is held.
2) When power is switched OFF and then ON or Reset switch is set to
neutral position
The operation result of the sequence program is output.
(As in enforced I/O cancellation)
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