Flowserve MX-100 Field Unit User Manual
Page 18
MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11
18
Table 2.4 – Register definitions
Register #
Description
Meaning
1
Command
Registers 1 and 2 are write-only registers used for Modbus
Function Code 06
2
Argument
Registers 1 and 2 are write-only registers used for Modbus
Function Code 06
3
Analog Output 1
Analog Output 1 Value (Default 0-100)
1
4
Analog Output 2
Analog Output 2 Value (Default 0-100)
1
5
Analog Input
Main Power (Volts)
6
Analog Input
Analog Input 1 (Default 0-100)
1
User 4-20 mA / 0-20 mA Input
7
Analog Input
Analog Input 2 (Default 0-100)
1
User 4-20 mA / 0-20 mA Input
8
Position
Valve Position, Scaled Value (Default 0-100)
1
9
Status Register
16 Bits of field unit status:
Bit 0 Opened
Bit 1 Closed
Bit 2 Stopped in Mid-Travel
Bit 3 Opening
Bit 4 Closing
Bit 5 Valve jammed
Bit 6 Not in Remote
2
Bit 7 Combined fault
3
Bit 8 Over temperature fault
Bit 9 Future Implementation
Bit 10 Network Channel A fault
4
(Terminals 5 and 4)
Bit 11 Network Channel B fault
4
(Terminals 13 and 14)
Bit 12 Open torque switch fault
Bit 13 Close torque switch fault
Bit 14 Valve-operated manually fault
Bit 15 Phase error
NOTE 1: Default value is scaled 0-100 of span. Changes made to “Analog Scale” affect analog registers (3, 4, 6, 7, 8)
and “move-to” commands. (0-100, 0-255, 0-4095)
NOTE 2: MX/DDC actuators shipped after 2nd QTR, 1999, have the following definition of Register 9 Bit 6. When this
bit has a value of 1 or true, the actuator is in LOCAL or STOP (unavailable for network control). The actuator
selector switch in REMOTE (available for network control) is indicated by Register 12 Bit 0 having a value of 1
or true.
IMPORTANT: Verify host program when installing an MX/DDC actuator shipped after 2nd QTR, 1999, on a network
commissioned before 2nd QTR, 1999, for proper indication of selector switch values. Failure to verify proper selector
switch indication at the host may cause unsafe conditions at the facility.
MX/DDC actuators shipped prior to 2nd QTR, 1999, have the following definition for Register 9 Bit 6. When this bit has
a value of 1 or true, the actuator selector switch is in LOCAL mode. This bit does not indicate STOP or REMOTE. The
actuator selector switch in REMOTE (available for network control) is indicated by Register 12 Bit 0 having a value of 1
or true. Register 9 Bit 6 value 0 (zero) or false AND Register 12 Bit 0 value 0 (zero) or false indicates selector switch is
in the STOP position.
NOTE 3: Combined Fault bit is high when Bit 5 or 8 or 9 or 15 or (Bits 10 and 11) is high.
NOTE 4: Channel A is physical connection A1. Channel B is physical connection A2. (See Appendix A.)