Hitachi LQZ700, Руководство пользователя

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4 USER GUIDE
4-3
z When the running system has broken down or stopped due to a fault, a SYS SW module error
occurs. The “ERR” LED comes on and the module is changed over to the standby system.
This error status is kept without a changeover to the running system until the cause of the error is
removed and the “ERR RESET” switch is pressed.
The SYS SW module detects an error in the following conditions.
•
The PCs OK signal of the LPU has changed from the “ON” status into the “OFF” status.
• The PI/O output “PI/O OK” of the LPU has changed from the “ON” status into the “OFF”
status.
(Note) The SYS SW module is not provided with a backup function at a blackout. If a
blackout/power recovery is performed when one side or both sides are faulty, the faulty
status holding function is cleared, so the LPU of the error system may become the
running system.
z The PI/O OK output signal is output to the PI/O output (area Y) by an application such as ladder.
The detailed contents are as follows.
(Example) When the SYS SW module is mounted in slot No.7 of the 8-slot mount base (slots 0
to 7) and 16 outputs are set, the PI/O OK output signal is output to “Y070”.
(Note) When using the PI/O OK output, be sure to set the LPU to “PI/O mounting.”
For details, refer to “USER’S MANUAL R70 BASIC MODULE (manual number
SVE-1-111)” or “ USER’S MANUAL BASIC MODULE (manual number
SVE-1-100) .”
(MSB) 2
15
1/0 0
…………………………………
0
2
0
(LSB)
PI/O OK Output Setting Bits
YW***