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G9SP-series Controllers Section 2-1
Input Filters
ON delays and OFF delays can be set to prevent malfunctions caused by
noise or by chattering of externally connected devices.
ON delays and OFF delays can be set for each terminal from 0 to 1,000 ms.
The effect of chattering from external devices can be reduced more by
increasing the delay time, but this will slow the response to input signals.
Precautions for Correct Use
• The ON and OFF delays can be set only as multiples of the cycle time of
the G9SP-series Controller. If the cycle time changes, e.g., when the pro-
gram is changed, the ON and OFF delay times will also change.
Example: Delays for a cycle time of 5 ms: ON delay of 10 × 5 ms = 50 ms
and OFF delay of 5 × 5 = 25 ms
Delays after changing cycle time to 6 ms: ON delay of 10 × 6 ms
= 60 ms and OFF delay of 5 × 6 = 30 ms
• The OFF delay time will affect the safety response performance. Add it to
the reaction time. (Refer to 3-2 Reaction Times.)
Error Notification
Self-diagnosis of Safety Input terminals provides notification of the locations
and causes of errors.
The following three methods can be used to check if errors have been
detected.
• Checking with the I/O indicators on the Front of the G9SP-series Control-
ler
The G9SP-series Controller will light or flash the I/O indicators on the front
panel if an error is detected in the Safety Input terminals. This lets you
identify the terminal where the error was detected. Refer to 2-1-1 Part
Names and Indicators for information on the indicator patterns.
• Checking with the G9SP Configurator
If the G9SP Configurator is connected online when an error has been de-
tected in the Safety Input terminals, the terminal where the error was de-
tected and the cause of the error can be checked. Refer to 10-1 Monitoring
Devices for the procedures and displays for using the G9SP Configurator.
• Checking with Option Board Communications
Option Board communications can be used when an error has been de-
tected in the Safety Input terminals to monitor the error location and error
cause from a Standard PLC. Refer to SECTION 7 Communications with a
Standard PLC Using an Option Board for detailed specifications on com-
munications procedures and data for Option Boards.
T: ON delay
T: OFF dela
Limit switch or other input
I/O tag
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