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Maintenance Functions of DST1-series Safety I/O Terminals Section 1-7
1-7-4 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
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. Select only one of these in the Mainte-
nance 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.
Safety I/O Terminal
Record in the Slave
Number of times output
contact changes to ON.
Output device
(e.g., relay)
I/O power
Number of
operations
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