36 PROCEDURE FOR STARTING UP A SYSTEM USING THE SIL2 PROCESS CPU
36.1 Overview
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11. Resetting the SIL2 Process CPUs
Restart both systems with either of the following methods.
• Powering off and on the systems
• Resetting the SIL2 Process CPUs
For starting up only one system, perform the following operation on the engineering tool to start up the system
as the control system within the time period set in "Other system Start-up Timeout Setting".
[Online] [Redundant PLC Operation] [Redundant Operation]
Select "Forced Start of Control System while Waiting for Other System to Start" and click the [Execute] button.
(When "Other system Start-up Timeout Setting" of "CPU Parameter" has not been changed, a stop error
occurs in 60 seconds.)
12. Checking the LEDs on the SIL2 Process CPU side
Check that the LEDs of each module are in the following states. The CARD READY LED status depends on whether an SD
memory card has been installed to each CPU module or not.
*1 In a redundant master station system, the MST LED of the master/local module in the standby system flashes.
When one system has been started up, a continuation error occurs since only the control system has been
started up. Thus, the ERROR LED of the SIL2 Process CPU and the L ERR LED of the redundant function
module turn on.
The BACKUP LED flashes because a system switching disable cause has been generated.
When an error has occurred, the following LEDs turn on. Check details on the error with the engineering tool and eliminate the
error cause.
• SIL2 Process CPU: ERROR LED ( MELSEC iQ-R CPU Module User's Manual (Startup))
• SIL2 function module: ERROR LED ( MELSEC iQ-R CPU Module User's Manual (Startup))
• Redundant function module: ERR LED, L ERR LED ( MELSEC iQ-R CPU Module User's Manual (Startup))
• Master/local module: ERR LED, L ERR LED ( MELSEC iQ-R Ethernet/CC-Link IE User's Manual (Startup))
• Control system
• Standby system
*1
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