Mitsubishi 00JCPU User Manual page 283

Execution of interrupt pointers, I32 to I48, are disabled when the system is powered on or when the CPU module is reset.
To use any of I32 to I41, enable the interrupt with the IMASK and EI instructions.
For details of the IMASK and EI instructions, refer to the following.
MELSEC-Q/L Programming Manual (Common Instruction)
(3) Precautions when using the Redundant CPU
(a) When using the interrupt program of interrupt pointer I41
I41 is an interrupt pointer that is used when the control system is switched to the standby system.
Note that the interrupt program of I41 is executed in the new standby system (the former control system) after
the system switching. Therefore, pay attention to the following.
1) Control system judgment flag and Standby system judgment flag in the special
relay (SM1515 and SM1516)
The Control system judgment flag and Standby system judgment flag indicate the standby system (SM1515:
OFF, SM1516: ON).
2) When changing tracking target devices
When change of tracking target devices has been programmed for the interrupt program of I41, devices of
the new standby system are overwritten with device data of the new control system (which is the system
switched from the standby system) by tracking transfer.
To change the tracking transfer devices in the interrupt program of I41, perform the following.
• In the Tracking settings tab of the Redundant parameter dialog box (
devices from the tracking transfer target.
• Create a program so that the tracking target device data will be transferred to other devices for the
change.
3) Outputs to the modules on the main base unit and network modules
Because the interrupt program of I41 is executed in the new standby system, the following outputs are not
performed.
• Output (Y) to the modules mounted on the main base unit
• Output (Y) to the MELSECNET/H remote I/O network
• Transmission from the link relay (B) and link register (W) to other stations on the MELSECNET/H remote
I/O network and MELSECNET/H PLC to PLC network
6.17.2LEDs indicating errors
When an error occurs, the LEDs on the front of the CPU module turns on/flashes. (
CHAPTER6 FUNCTIONS
Section 8.2(2)), remove the
Section 6.21)
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