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Section 9: Remote Network Control
May 2019
Section 9: Remote Network Control
9.1
Modbus RTU
The native language of the MPA is Modbus RTU. If other network protocols such as Foun-
dation Fieldbus are used, a Communication Adapter Module (CAM) module is installed
to translate between the selected protocol and Modbus. The controller supports Modbus
function codes 01,02,03,04,05,06,15,16. Following are the memory maps for discrete I/O
and unsigned 16-bit Holding registers used in this application. All memory maps shown are
zero based, i.e. register 1 = holding register 40002. reading Input Bit 0 using FC02 = 10001.
9.1.1
9.1.2
26
Discrete Input Map (Valve Status) and Alarms
Table 7.
Discrete Input Map (Valve Status) and Alarms
Bit Input
Detail
0
16
At commanded port within 1 degree
1
17
At commanded port within 2 degrees
2
18
Flow selector moving
3
19
Wrong direction alarm
4
20
Selector switch Local/Manual Mode
5
21
Selector switch Remote/Auto Mode
6
22
Over torque alarm
7
23
Stop between ports alarm
8
24
Flow selector stall alarm
9
25
Power monitor alarm
A
26
Motor thermal overload alarm
B
27
Phase monitor alarm
C
28
Local ESD alarm
D
29
Actuator fail alarm
E
30
No input (always zero)
F
31
Unit alarm (above alarms are OR'ed)
These same status and alarm bits are duplicated in Modbus Registers 01, 06, 09
(40002, 40007, 40010) in the same bit sequence shown above.
Coil Map (Discrete Network Control)
There are only two coils used for discrete network control as follows. When Coil 10
is set by the host, the actuator resets the coil automatically when the command is
executed. When Coil 11 is set, the host must reset the coil before the actuator will
respond to any other command.
Table 8.
Coil Map (Discrete Network Council)
Coil Detail
10
Go to next port
11
Host ESD command, Go to Home Port
Installation, Operation and Maintenance Manual
MAN-02-10-93-0700-EN Rev. 0
Remote Network Control
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