Bronkhorst®
Instruction Manual ES-FLOW™ 1xxC
9.17.153A
31
PID-Kp
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Float
RW
B
0…1E+10
167
114/21
0xF2A8…0xF2A9/62121…62122
PID controller proportional action, multiplication factor.
PID-Ti
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Float
RW
B
0…1E+10
168
114/22
0xF2B0…0xF2B1/62129…62130
PID controller integral action in seconds.
PID-Td
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Float
RW
B
0…1E+10
169
114/23
0xF2B8…0xF2B9/62137…62138
PID controller derivative action in seconds. The default value is 0.0.
Open From Zero Response
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char
RW
B
0…255
165
114/18
0x0E52/3667
Response factor, applied to proportional action when opening the valve from 0%.
·
Default value: 128 (no correction)
·
Other values adjust the controller gain (correction signal) as follows: Controller gain =
Controller Speed
*
PID-Kp
*
1.05
(response factor - 128)
Normal Step Response
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char
RW
B
0…255
72
114/5
0x0E45/3654
Response factor, applied to proportional action during normal control (at setpoint step).
·
Default value: 128 (no correction)
·
Other values adjust the controller gain (correction signal) as follows: Controller gain =
Controller Speed
*
PID-Kp
*
1.05
(response factor - 128)
Stable Situation Response
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned char
RW
B
0…255
141
114/17
0x0E51/3666
Stable situation response, applied when the controller is stable (within a 2% band around the setpoint).
·
Default value: 128 (no correction)
·
Other values adjust the controller gain (correction signal) as follows: Controller gain =
Controller Speed
*
PID-Kp
*
1.05
(response factor - 128)
6.1.6
Master/slave configuration (FLOW-BUS)
Normally, there is no communication between the instruments in a fieldbus system. The FLOW-BUS protocol, however,
provides a feature to set up a master/slave relationship between two instruments. The typical behavior of a slave
instrument is to automatically set its own setpoint relative to the output (measurement value) of its master.
The output value of any instrument in a FLOW-BUS network is automatically available to all other instruments without
extra wiring. A slave instrument can also be a master to other instruments.
To setup a master/slave relationship between instruments, first determine which instrument should be the master and
which should be the slave, then set
Control Mode
of the slave instrument to ‘FLOW-BUS Slave’ (value 2) or ‘FLOW-BUS Analog
Slave’ (value 13), depending on how the setpoint should be calculated (see parameter
).
