Siemens SIPROCESS GA700 Operating Manual page 178

Functions
6.9 [2.10] Settings > Correction of cross-interferences
3. Select source for correction value: "Source of correction value" parameter field
The following sources can be set for the correction of cross-interference:
– "Device-internal"
– "MODBUS TCP"
– "Analog input" (with installed option module 2)
Depending on the set parameter value, there will be different operating steps:
178
NOTICE
Malfunction of the device with correction of cross-interference via an analog input
The following applies to prevent the device from malfunctioning: Make sure that the
correction gases in → menus "2.10.3" to "2.10.6" and "2.09.1.n" match. For additional
information, see also → Set analog inputs (Page 137).
"Device-internal"/"Analog input"
Select an internally measured correction
•
value. "Component" parameter field.
The selection list contains all existing com-
ponents of the device except the respective
current measured component.
Enter substitute value for the measured
•
interference gas concentration.
"Substitute value" parameter field.
If the measurement of the interference gas
concentration fails, the set substitute value
is used for the correction of cross-
interference.
The measured value status is set to "Uncer-
tain".
The unit of the substitute value corresponds
to that of the configured interference gas.
Source of correction value
Determine external analyzer which delivers
•
the correction value via MODBUS TCP.
"MODBUS node" parameter field
Select external measured correction value
•
for correction of cross-interference via
MODBUS TCP.
"Measured value" parameter field.
Enter substitute value for the externally
•
measured interference gas concentration.
If the measurement of the interference gas
concentration fails, the set substitute value
is used for the correction of cross-
interference. The measured value status is
set to "Uncertain".
The unit of the substitute value corresponds
to that of the configured interference gas.
Operating Manual, 06/2017, A5E31930478-05
"MODBUS TCP"
Operating with the Local User Interface