Flowserve MX-100 Field Unit Manual de usuario descargar pdf (Pagina 25)

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

00 Force Data Hi 00 Preset Data Hi

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

1A Force Data Hi 1A Preset Data Hi

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.

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 65 66

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Flowserve MX-100 Field Unit Manual de usuario Pagina 25

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