Honeywell Experion PKS User Manual page 135

Data Processing
When a Siemens AS-i-Link DSB is loaded, it performs the following:
• Checks for communication status with slave.
– If the DSB is communicating with the slave, the SLAVESTATE parameter is set to "Communicating."
– If there is a communication error between the DSB and the slave, the SLAVESTATE parameter is set to
"Communication error" and notifications are sent accordingly.
• For each configured PDC, checks its communication with PB and PIOMB and sets the PDCSTATE
accordingly.
• For PDCs that are configured as DI module, Siemens AS-i-Link DSB performs the following:
– Receives extended diagnostic data and process data from the slave device.
– Updates CHDATABOOL parameter with the value of each channel.
– Processes extended diagnostic data and sends notification based on extended diagnostic data.
– Updates channel status based on extended diagnostics.
• For PDCs that are configured as DO module, it performs the following.
– Processes extended diagnostic data, updates channel status, and sends notifications based on channel
status.
– Checks if the configured PDC is associated with a PIOMB.
• If a configured PDC is associated with a PIOMB, it performs the following:
– Receives recent data from the PIOMB and sends it to the device.
– Updates the CHDATABOOL parameter of the configured DO module with the data sent to the end
device.
• If a configured PDC is not associated with a PIOMB, it sets the channel values to 0.
Attention
In the event of a loss of communication with the PGM, the Siemens DP/AS-i-Link DSB changes the output value
internally. However, when the device is reconnected, the current internal value is written to the device. This value is
reflected by the CHDATABOOL parameter.
Extended Diagnostics
Tip
You can view the diagnosis and extended diagnosis of the devices online. For more information, see "Viewing the
slave device diagnosis" on page 100 and "Viewing the slave device's extended diagnosis" on page 101 respectively.
In the extended diagnostic processing, the diagnostic conditions are not mutually exclusive and both the internal
error and the hardware error may be signaled.
The following table lists the various channel states that a channel can assume based on the extended diagnostics.
Extended Diagnostic
Internal error
External error
Unexpected slave configuration
AS-Interface voltage low
Hardware error
DP/AS-I Link module is offline
EEPROM is defective
Slave error (for slave X)
Affected channels
All channels in all PDCs
Does not impact the channel status
Does not impact the channel status
Does not impact the channel status
All channels in all PDCs
All channels in all PDCs
All channels in all PDCs
All channels associated with AS-i slave X
7 DEVICE SUPPORT BLOCK (DSB)
Channel status
Bad_DevError
Left as-is
Left as-is
Left as-is
Bad_DevError
Bad_OutOfServError
Bad_DevError
Bad_NonSpecific
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