Flowserve MX-100 Field Unit Manual de usuario descargar pdf (Pagina 26)

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

To move the actuator to a position of 50%, place the value 0x4B in the high byte and the value of 0x32 (50 decimal) •

into the low byte.

Example:

Hex format: 0x4B32

To use the decimal method of determining a single write “move-to” command, add the desired position value to

19200.

Example:

Desired position: 50%

19200 + 50 = 19250

Example of single write “move-to” command

Move an actuator at address 1 to 50% of open by writing the value of 19250 (0x4B32) to the ﬁeld unit 40001 register.

The actuator will then move to a position of 50% open.

Example

Query: 010600004B323EEF

Response: 010600004B323EEF

Message Breakdown

Query Response

01 Slave Address 01 Slave Address

06 Function 06 Function

00 Starting Address Hi 00 Starting Address Hi

00 Starting Address Lo 00 Starting Address Lo

4B Preset Data Hi 4B Preset Data Hi

32 Preset Data Lo 32 Preset Data Lo

3EEF Error Check (LRC or CRC) 3EEF Error Check (LRC or CRC)

2.3.9 Modbus Function Code 08 (Diagnostics)

This function code provides a series of tests for checking the communication system between the Host and ﬁeld units

(slaves), or for checking various error conditions within the ﬁeld unit. This function code uses a two-byte subfunction

code ﬁeld in the query to deﬁne the type of test to be performed. The ﬁeld unit echoes both the function code and

subfunction code in a normal response. It does not affect the ﬁeld unit in any way. If this exchange is successful, then

the communication is successful.

A listing of the supported diagnostic two-byte subfunction codes is given in Table 2.7.

Example

Request a loopback (return query data) from the ﬁeld unit at network address 3.

Query: 030800000000E1E9

Response: 030800000000E1E9

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 65 66

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Flowserve MX-100 Field Unit Manual de usuario Pagina 26