Dynamic Status Item Parameters
- Last UpdatedAug 04, 2025
- 2 minute read
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UNINTENDED EQUIPMENT OPERATION
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Failure to follow these instructions can result in death, serious injury, or equipment damage. |
Note: Always seek the advice of Technical Support personnel for this product regarding undocumented features.
By default, the driver subscribes to #PLCQualStatus to determine the current operational status of a device. It is also possible to specify a custom item value that the driver will check in addition to #PLCQualStatus. This can be useful to confirm that the driver will put the I/O device offline if OFS becomes unresponsive.
The item value must be periodically changing in the PLC. If it stops, the driver will put the I/O device offline. This behavior is controlled by the following parameters.
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[OFSOPC]Parameter |
Allowable Values |
Default Value |
Description |
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DynamicStatusItemName |
PLC item name |
- |
This parameter specifies the item name that gets updated in PLC at a certain interval. Some system items are already programmed in the PLC and can be used to avoid changes to the PLC program. For example, %S4, %S5, %S6 have value updates every 5ms, 50ms, or 500ms correspondingly. |
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DynamicStatusItemInterval |
1 - 2147483647 (seconds) |
0 |
This parameter specifies the period which the driver will use to check the status of the item specified by the DynamicStatusItemName parameter. If the item value has not changed during the period specified, the driver will put the I/O device offline. For the system items %S4, %S5, %S6, the parameter can be set to 1 second. |
These parameters can only be specified for a specific I/O device using the syntax below.
[OFSOPC]
<Cluster>.<IOServerName>.<IODeviceName>.<Parameter>=<Value>
Where:
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<Cluster> = the name of the cluster configured in Plant SCADA.
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<IOServerName> = the name of the I/O server to which the device is connected.
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<IODeviceName> = the name given to the device in your project.
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<Parameter> = the parameter name.
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<Value> = the parameter value.