7.3 Data processing
When a DSB is loaded, it performs the following:
• Checks for communication status with slave device.
– If the DSB is communicating with the slave device, the SLAVESTATE parameter is set to
"Communicating."
– If there is a communication error between the DSB and the slave device, 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 AI or DI module, the DSB performs the following:
– Receives extended diagnostic data and process data from the slave device.
– Updates CHDATARAW parameter for AI modules, performs percentage range conversion, and updates
CHDATAREAL parameter.
– 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 AO or DO module, the DSB 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, the DSB performs the following:
– Receives recent data from the PIOMB and sends it to the device.
– Updates the CHDATARAW and CHDATAREAL parameters of the configured AO module with the data
sent to end 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, the DSB sets the channel values to 0.
7.3.1 Extended range handling
Output channels
For output channels, whenever the output value received from the C300 is greater than the maximum range, the
output value is clamped to the maximum possible value maintaining the channel status as
"GoodCascade_NonSpecific."
For example, consider the following scenario.
The high range of a channel is 20000 and the extended high range of a channel is value 25000. In such a
scenario, if the value received from the C300 is 27000, then this value is clamped to 25000.
However, when there is no association of a PDC to a PIOMB, and when you try to enter the output values that
are out of range, the following error message "kVAStsLimitOrRangeExceeded" appears. In such a case, the last
good value is retained.
Input channels
For input values which are out of the maximum extended range, the input channel status is set to
"Bad_DevError." However, the same value is sent to the C300. The DSB does not clamp the value received
from the device to extended range limits.
The extended range lower limit for all the analog input modules is "0."
7 DEVICE SUPPORT BLOCK (DSB)
118
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Summary of Contents for Experion PKS
Page 1: ...Experion PKS PROFIBUS Gateway Module User s Guide EPDOC XX88 en 431E June 2018 Release 431 ...
Page 8: ...CONTENTS 8 www honeywell com ...
Page 10: ...1 ABOUT THIS GUIDE 10 www honeywell com ...
Page 32: ...4 PROFIBUS GATEWAY MODULE PGM INSTALLATION 32 www honeywell com ...
Page 58: ...5 PROFIBUS GATEWAY MODULE PGM BLOCK 58 www honeywell com ...
Page 69: ...6 PROTOCOL BLOCK 69 ...
Page 103: ...5 Click OK 6 PROTOCOL BLOCK 103 ...
Page 110: ...6 PROTOCOL BLOCK 110 www honeywell com ...
Page 183: ...PDC Details tab Figure 6 Detail Display of PDC Details tab 7 DEVICE SUPPORT BLOCK DSB 183 ...
Page 186: ...7 DEVICE SUPPORT BLOCK DSB 186 www honeywell com ...
Page 231: ...9 PROFIBUS I O MODULE PIOMB FUNCTION BLOCK 231 ...
Page 232: ...9 PROFIBUS I O MODULE PIOMB FUNCTION BLOCK 232 www honeywell com ...
Page 236: ...10 PROFIBUS GATEWAY MODULE PGM CONFIGURATION EXAMPLE 236 www honeywell com ...
Page 264: ...13 PROFIBUS GATEWAY MODULE PGM TROUBLESHOOTING 264 www honeywell com ...