Flowserve MX-100 Field Unit Instrukcja Użytkownika Pobierz pdf (Strona 14)

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

2.3.2 Modbus Function Codes

The controlling device (master) must conform to the Modbus protocol as deﬁned in the Modbus-IDA Modbus

Application Protocol Speciﬁcation V1.1a (http://www.Modbus-IDA.org) and support Modbus function codes 01

through 06, 08, 15, and 16. These function codes are a subset of the complete protocol and are deﬁned in Table 2.1.

Table 2.1 – Modbus function codes supported

Extended

Function Bit/Register Addressing

Code Name Addressing Range

01 Read Coil Status Bit 0,000 - 9,999

02 Read Discrete Inputs Bit 10.000 - 19,999

03 Read Holding Register Register 40,000 - 49,999

04 Read Input Register Register 30,000 - 39,999

05 Force Single Coil Bit 0,000 - 9,999

06 Preset Single Register Register 40,000 - 49,999

08 Diagnostics N/A N/A

15 Force Multiple Coils Bit 0,000 - 9,999

16 Preset Multiple Registers Register 40,000 - 49,999

See Table 2.2 for a complete listing of MX/DDC holding registers.

2.3.3 Modbus Function Code 01 (Read Coil Status)

This function code is used to read the coil status in the DDC-100 Field Unit. There are nine coils available to be read

on DDC-100 Field Units as shown in Table 2.2. For the MX/DDC, Coil 1 indicates CLOSE contactor and is interlocked

with Coil 2, Coil 2 indicates OPEN contactor and is interlocked with Coil 1. When the I/O Module is used in non-MOV

(motor-operated valve) mode, relays 1 through 6 or coils 3 through 8 are available for user conﬁguration.

Table 2.2 – DDC-100 coil assignments, Modbus 05 command usage for digital outputs

Coil Number Bit Number Function

1 00 Close/Stop

2 01 Open/Stop

3 02 S1 or R1 (Opt) Latched

4 03 S2 or R2 (Opt) Latched

5 04 R3 (Opt) Latched

6 05 R4 (Opt) Latched

7 06 R5 (Opt) Latched

8 07 R6 (Opt) Latched

9 08 R7 (Opt) Latched

10 09 R8 (Opt) Latched

The normal response to the (05) command is an echo of the command.

Example

Poll ﬁeld unit number 3 for 8 coils starting at coil 1.

Query: 0301000000083C2E

Response: 03010118503A

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 65 66

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Flowserve MX-100 Field Unit Instrukcja Użytkownika Strona 14