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Interfaces to automation systems
8.2 Modbus interface
SITRANS SL
Operating Instructions, 12/2010, A5E01132948-04
139
Quality byte coding for measurement output:
Table 8- 1
Status coding for "bad quality":
Dec
Hex
Cause
Remedy
00
00
Maintenance fault or process value fault. See alarm list
Table 8- 2
Status coding for "uncertain quality":
Dec
Hex
Cause
Remedy
64
40
Maintenance demanded or process value
warning or process value out of tolerance.
See alarm list.
Table 8- 3
Status coding for "good quality":
Dec
Hex
Cause
Remedy
128
80
Normal operation
You can evaluate the measured values.
Quality byte coding of input values for process pressure and process temperature:
Table 8- 4
Status coding for "bad quality":
Dec
Hex
Cause
Remedy
00
00
Quality status of source is bad
Depending on the PROFIBUS source the
quality status is mapped to error code
E12 for temperature or E16 for pressure.
01
01
Quality status of source is bad and temp.
or pressure is low limit
Temperature: E12 & E13
Pressure: E16 & E17
02
02
Quality status of source is bad and temp.
or pressure is high limit
Temperature: E12 & E14
Pressure: E16 & E18
03
03
Quality status of source is bad and temp.
or pressure is constant
Temperature: E12 & E15
Pressure: E16 & E19