Bronkhorst®
Instruction Manual ES-FLOW™ 1xxC
9.17.153A
22
5.6.3
Digital procedure on PROFIBUS DP
For instruments with a PROFIBUS DP interface, the procedure to be followed differs slightly:
To adjust the zero point through bus communication in a PROFIBUS DP system, set (write) parameter values in the following
sequence (see section
for more information about instrument parameters):
Sequence #
Parameter
Value
Action
1
Setpoint
0
stop flow (close control valve)
2
Initreset
64
unlock secured parameters
3
Calibration mode
0
reset calibration mode
4
Calibration mode
22
start zeroing
5
Calibration mode
0
reset calibration mode
Calibration mode
must be reset after the zeroing procedure is started, but before the procedure finishes. By keeping
Calibration mode
at value 22, the zeroing procedure will be started again immediately after it finishes.
The zeroing procedure takes approximately 25 seconds to complete (longer if the output signal is unstable).
After starting the zeroing procedure, the value of parameter
Calibration mode (read)
changes to 9, to indicate the procedure is
running. Upon completion,
Calibration mode (read)
changes to 0 if the procedure is successful; if the procedure fails, it
changes to 255.
After performing the procedure, remember to set parameter
Initreset
to value 0 to lock secured parameters
