Flowserve MX-100 Field Unit Manual de usuario descargar pdf (Pagina 28)

MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

Message Breakdown

Query Response

01 Slave Address 01 Slave Address

0F Function 0F Function

00 Coil Address Hi 00 Coil Address Hi

00 Coil Address Lo 00 Coil Address Lo

00 Quantity of Coils Hi 00 Quantity of Coils Hi

01 Quantity of Coils Lo 01 Quantity of Coils Lo

01 Byte Count 940B Error Check (LRC or CRC)

01 Force Data Lo

EF57 Error Check (LRC or CRC)

Note: 000000010101h equals Coil Address 00000001 (ﬁeld unit coil 1)

000100010101h equals Coil Address 00000010 (ﬁeld unit coil 2)

2.3.11 Modbus Function Code 16 (Preset Multiple Registers)

This function code is used to preset single or multiple registers in the ﬁeld unit and uses the same predetermined

writing values to the 40001 and/or 40002 registers.

Modbus function code 16 command values for controlling the DDC-100 Field Unit are given in Table 2.6. Each

command should be issued only one time for the desired ﬁeld unit control. Repeated issuance of an acknowledged

command will degrade network performance.

The normal response returns the slave address, function code, starting address, and quantity of registers preset.

NOTE: This function code is implemented in DDC Modbus Firmware 2.00 and greater and MX-DDC Firmware

02/01.00 and greater.

Example of Field Unit Command

Write the command to open an actuator (actuator open) to ﬁeld unit number 1. This corresponds to writing the value

256 into ﬁeld unit register 40001.

Query: 011000000001020100A7C0

Response: 01100000000101C9

Message Breakdown

Query Response

01 Slave Address 01 Slave Address

10 Function 10 Function

00 Starting Address Hi 00 Starting Address Hi

00 Starting Address Lo 00 Starting Address Lo

00 Number of Registers Hi 00 Number of Registers Hi

01 Number of Registers Lo 01 Number of Registers Lo

02 Byte Count 01C9 Error Check (LRC or CRC)

01 Preset Data Hi

00 Preset Data Lo

A7C0 Error Check (LRC or CRC)

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 65 66

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Flowserve MX-100 Field Unit Manual de usuario Pagina 28