Mitsubishi Electric QJ71E71-100 User Manual page 349

• When a ULP timeout occurs
Tnc = Ttu + St + Tsw
• Tnc : System switching time
• Ttu : TCP ULP timer value
• St : One scan time
• Tsw :
CPU system switching time
The following shows the system switching operation timing if a ULP timeout occurs.
Control system (system A)
QJ71E71-100
Station No.1
System switching
request
QJ71E71-100 (station No.1)
Scan time of the system A CPU
System A
System B
Scan time of the system B CPU
QJ71E71-100 (station No.2)
*1 For details on CPU system switching time, refer to the following.
QnPRHCPU User's Manual (Redundant System)
*1
Connected device
A communication
error occurred.
Standby system (system B)
Tracking cable
No response from the connected device
Operating as a control system Operating as a standby system
Ttu
Issuing a system
switching request
Control system Standby system
Standby system
Operating as a standby system
Tnc
QJ71E71-100
Station No.2
Tsw
Control system
Operating as a control system
APPENDICES
A
347