Flowserve MX-100 Field Unit - Manual (Page 25)

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MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11
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Example of “Move-To” Command
Move an actuator at address 179 to 42% of open by first writing the value of 42 to the field unit 40002 register. After
receiving a response from the field unit, write the value of 6656 to the field unit 40001 register. The actuator will then
move to a position of 42% of open.
First Command
Query:
B3060001002A4207
Response: B3060001002A4207
First Command Message Breakdown
Query Response
B3 Slave (Field Unit) Address B3
Slave (Field Unit)
Address
06 Function 06 Function
00 Register Address Hi 00 Register Address Hi
01 1 Register Address Lo 01 Register Address Lo
00 Force Data Hi 00 Preset Data Hi
2A 2 Force Data Lo 2A Preset Data Lo
4207 Error Check (CRC) 4207 Error Check (CRC)
Note 1: 001h equals Register Address 40002 (field unit register 2, argument register).
Note 2: 002Ah equals 42.
Second Command
Query: B30600001A009978
Response: B30600001A009978
Second Command Message Breakdown
Query Response
B3 Slave (Field Unit) Address B3
Slave (Field Unit)
Address
06 Function 06 Function
00 Register Address Hi 00 Register Address Hi
00 1 Register Address Lo 00 Register Address Lo
1A Force Data Hi 1A Preset Data Hi
00 2 Force Data Lo 00 Preset Data Lo
9978 Error Check (CRC) 9978 Error Check (CRC)
Note 1: 0000h equals Register Address 40001 (field unit register 1, command register).
Note 2: 1A00h equals 6656.
Example of single register write “move-to” command
This command allows a Host to issue the “move-to” command with a single write utilizing the Modbus function code
06. Register 1 will be used to complete this command.
Rules for utilizing this command:
Field unit scaling must be configured for 0-100. •
To use the hexadecimal method of determining a single write “move-to” command, 0x4B is always placed into the •
Hi Byte of Register 1. The desired position value is always placed into the Lo Byte of Register 1.