Omron DeviceNet Safety, System Configuration Manual

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Maintenance Functions (Unit Version 1.0 or Later) Section 7-2
7-2 Maintenance Functions (Unit Version 1.0 or Later)
This section describes the maintenance functions of NE1A-series Controllers
with version 1.0 or higher (including NE1A-SCPU01-EIP and NE1A-SCPU02-
EIP).
7-2-1 Total ON Time Monitor Function
Overview
In NE1A-series Controllers with unit version 1.0 or later (including NE1A-
SCPU01-EIP and NE1A-SCPU02-EIP), this function times how long a local
input, test output, or local output is ON and stores that total ON time internally
in non-volatile memory.
• Count range: 0 to 4,294,967,295 s
(stored as 00000000 to FFFFFFFF hex)
• Count units: Seconds
This information can be monitored using the Network Configurator or explicit
messaging.
Note (1) The Total ON Time Monitor function (Time) and Contact Operation
Counter function (Count) cannot be used simultaneously on one bit. Se-
lect one of these functions with the Maintenance Counter Mode Choice
setting.
(2) When the Maintenance Counter Mode Choice setting is changed, the col-
lected data (operations count or total ON time) will be cleared.
(3) These functions do not operate when the I/O power supply is OFF.
(4) The Total ON Time Monitor function checks whether the connected de-
vice is ON at about 1-s intervals. This function may not count the total ON
time precisely if the device is ON for intervals of less than 1 second.
■
Calculating the Total ON Time with 0.5-s ON Pulses
In figure A, the bit is actually ON for 0.5 s
×
3 = 1.5 s, but the bit is ON just
once when the status is checked, so the total ON time is measured as 1 s.
Total ON time
Sensor
I/O power supply
Total ON time
Connected device
ON
OFF