Flowserve MX-100 Field Unit Manual de usuario descargar pdf (Pagina 27)

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

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Message Breakdown

Query Response

03 Slave (Field Unit) Address 03 Slave (Field Unit) Address

08 Function 08 Function

00 Subfunction Hi 00 Subfunction Hi

00 Subfunction Lo 00 Subfunction Lo

00 Data Hi 00 Data Hi

00 Data Lo 00 Data Lo

E1E9 Error Check (CRC) E1E9 Error Check (CRC)

Table 2.7 – Diagnostic Codes Supported by the DDC-100 Field Unit

Code Name

00 Return Query Data

01 Restart Communication Option

02 Return Diagnostic Register

03 Change ASCII Input Delimiter

04 Force Listen-Only Mode

10 (0A Hex) Clear Counters and Diagnostics Register

11 (0B Hex) Return Bus Message Count

12 (0C Hex) Return Bus Communication Error Count

13 (0D Hex) Return Bus Exception Error Count

14 (0E Hex) Return Slave Message Count

Note 1: Contains DDC-100 Field Unit diagnostic information. For engineering use only.

2.3.10 Modbus Function Code 15 (Force Multiple Coils)

This function code allows the user to force multiple coils with a single command and uses the same coil assignments

as the function code 05.

It should be noted that the coils are operated from the lowest coil number to the highest. Forcing coil 1 or 2 OFF (0) is

considered a stop command, sending a 15 command to force two coils starting with coil 1, with coil 1 ON and coil 2

OFF, would result in the unit stopping, since coil 2 is forced OFF after coil 1 is forced ON.

To prevent inadvertent Stop commands from being issued, it is recommended to force one coil at a time.

Available digital outputs for DDC-100 Field Units are listed in Table 2.5. Force multiple coil commands should be

issued only once for the desired ﬁeld unit control. Repeated issuance of an acknowledged command will degrade

network performance.

NOTE: This function code is implemented in UEC-3-DDC Modbus Firmware 2.00 and greater and MX-DDC Firmware

02/01.00 and greater

Example of force coil command

Force coil 1 of ﬁeld unit 1 ON. This will CLOSE the valve controlled by ﬁeld unit 1.

Query: 010F000000010101EF57

Response: 010F00000001940B

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Flowserve MX-100 Field Unit Manual de usuario Pagina 27