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Status Area Section 4-2
4-2 Status Area
4-2-1 Status Areas of Digital I/O Units
The Digital I/O Units have two status areas. Each Unit’s Status Flags are
turned ON and OFF based on the threshold/monitor values set for the func-
tion in that Unit. A flag in the Communications Unit will be turned ON only
when the corresponding flag has been turned ON in one of those status
areas.
The Communications Unit’s Status Flag information is transmitted to the Mas-
ter. The I/O Unit’s status area information can be read from a Programming
Device.
Warning Status Area The Slice I/O Unit’s Warning Status Area contains the following 16 bits. The
Warning Status Area provides notification of minor errors detected in the Unit.
When any of these flags goes ON, bit 2 of the Communications Unit’s Status
Flags is turned ON and that information is transmitted to the Master.
Slice I/O Unit
Communications Unit
Flags are turned ON when the corresponding
monitor value is exceeded. The flag status can
be read from a Programming Device.
When one of the I/O Unit's status flags
goes ON, the corresponding status flag
in the Communications Unit is turned ON.
Transmitted
to Master
Master
Bit Content Description
0 Reserved ---
1 Reserved ---
2 Reserved ---
3 Unit Maintenance Flag
OFF: Normal
ON: Error (Over threshold or 87672
hours)
Monitors the power ON time warning
value set for the Unit Conduction
Time Monitor function.
Also monitors whether 87672 hours
(10 years) have elapsed.
4 Reserved ---
5 Reserved ---
6 Reserved ---
7 Reserved ---
8 Operation Time Monitor Flag
OFF: Within range (below set value)
ON: Out-of-range (exceeded set
value)
Monitors whether the operating time
for the specified I/O bits is within the
warning value set for the Operation
Time Monitor function.
9 Connected Device Maintenance Flag
OFF: Within range (all points below set
value)
ON: Out-of-range (one or more points
exceeded set value)
Monitors the warning value set for the
Contact Operation Counter or Total
ON Time Monitor function.
10 Reserved ---
11 Reserved ---
12 Reserved ---
13 Reserved ---
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