Monitoring The Contact Operation Counters - Omron DEVICENET SAFETY - CONFIGURATION MANUAL 05-2005 System Configuration Manual

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Monitoring the Contact Operation Counters

Description
A DST1-series Safety I/O Terminal totals the number of times each safety input contact, test output contact,
and safety output contact turns ON and internally saves the data in non-volatile memory. If the value of a
counter reaches the threshold value, the Connected Component Maintenance Flag in General Status will
turn ON.
• Measurement count: 0 to 4,294,967,295 counts (stored data: 0000 0000 to FFFF FFFF hex)
• Measurement unit: Operations
• Maximum resolution: 166.7 Hz
OFF → ON
The user can monitor this information using the Network Configurator and explicit messages.
Note: – One contact cannot be used at the same time for both the time and count monitoring functions. Se-
lect only one of these in the Maintenance Counter Mode Choice.
– If the Maintenance Counter Mode Choice is changed, the counter or time data saved internally will
be cleared.
– This function does not operate when the I/O power supply is OFF.
Setting the Contact Operation Counter Threshold Using the Network Configurator
Set the Maintenance Counter Mode Choice Parameter and Threshold Maintenance Counter Parameter for
each I/O of the safety input group, test output group, and safety output group.
When the Threshold Maintenance Counter is set to 0, the threshold value will not be checked.
124
Safety I/O Terminal
Recorded in Slave
Number of
operations
I/O power
Output device
(e.g., relay)
Number of times output
contact changes to ON
Section 7: Monitoring Devices
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