Omron GRT1-PNT - DATASHEET 2 Operation Manual page 99

Provider/Consumer Model
The device model is shown in the following graph:
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Number Description
1 Communication Unit
2 I/O Module
3 Submodule
4 Channel
The data exchange between IO Controller and the IO Devices is carried out
based on the provider-consumer model. The provider sends its data to the
consumer without a request from the other device. The consumer processes
the data. The provider (as the consumer) is either the IO Controller or the IO
Device.
The Input Output Provider Status (IOPS) indicates the status of the data
source (valid or invalid) for each of the modules as part of the data exchange
message. This can be the Output data for the IO Controller and the Input data
for the IO Device. The provider status is either bad or good, implying the
received data is either invalid or valid for use. For example the Output data of
the IO Controller is set to bad in case the PLC is in Program mode.
The Input Output Consumer Status (IOCR) indicates the feedback on the
provided data received before. This status (Bad or Good) is indicated in the
Input data for the IO Controller and the Output data for the IO Device. As an
example when considering the IO Controller Redundancy: an IO Device will
only feedback to the active IO Controller it has consumed its output (status
Good). The standby IO Controller will get IOCR Bad status as response.
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