Flowserve MX-100 Field Unit Instrukcja Użytkownika Pobierz pdf (Strona 17)

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

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Table 2.3 – Status Bit Deﬁnitions (continued)

Bit Number

Modbus

Bit

Address

MX/DDC

205 204 Lost Phase Input

206 205 Phase Reverse Input

207 206 Not used

208 207 PB DP board present

Example

Poll ﬁeld unit number 22 for 16 inputs starting at input 129 with the actuator opening.

Query: 1602008000107B09

Response: 1602020108CDED

Message Breakdown

Query Response

16 Slave (Field Unit) Address 16 Slave (Field Unit) Address

02 Function 02 Function

00 Starting Address Hi 02 Byte Count

80 Starting Address Lo 01

Data (Inputs 10136 - 10129)

00 No. of Points Hi 08

Data (Inputs 10144 - 10137)

10 No. of Points Lo CDED Error Check (CRC)

7B09 Error Check (CRC)

Note 1: 01h equals 0000 0001 (actuator open input bit is ON).

Note 2: 08h equals 0000 1000 (actuator Channel B Fail bit is ON).

2.3.5 Modbus Function Code 03 (Read Holding Register)

This function code is used to read the binary contents of holding registers in the DDC-100 Field Unit. This function

code is typically used during the network polling cycle. A network poll should consist of ﬁeld unit registers 9 (Status)

and 10 (Fault) as a minimum. Holding register 8 should also be polled when the actuator is conﬁgured for the analog

feedback option or position control. See Table 2.4 for a complete listing of the holding registers.

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 65 66

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Flowserve MX-100 Field Unit Instrukcja Użytkownika Strona 17