Flowserve MX-100 Field Unit Uživatelský manuál stáhnout pdf (Strana 22)

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

Message Breakdown

Query Response

46 Slave (Field Unit) Address 46 Slave (Field Unit) Address

04 Function 04 Function

00 Starting Address Hi 08 Byte Count

04 Starting Address Lo FF Data Hi (Register 40005)

00 No. of Points Hi FF

Data Lo (Register 40005)

04 No. of Points Lo FF Data Hi (Register 40006)

BF7F Error Check (CRC) FF

Data Lo (Register 40006)

00 Data Hi (Register 40007)

Data Lo (Register 40007)

00 Data Hi (Register 40008)

Data Lo (Register 40008)

DBA8 Error Check (CRC)

Note 1: FFFFh equals 65535 Decimal (actuator Analog Input 4 value).

Note 2: FFFFh equals 65535 Decimal (actuator Analog Input 3 value).

Note 3: 002Bh equals 43 Decimal (actuator Analog Input 2 value).

Note 4: 001Eh equals 30 Decimal (actuator Analog Input 1 in percent format).

2.3.7 Modbus Function Code 05 (Force Single Coil)

This function code is used to force a single coil in the DDC-100 Field Unit. Forcing the individual coil either ON (1) or

OFF (0) will energize or de-energize a coil (digital output) in the ﬁeld unit. Coil 1 in the ﬁeld unit closes the actuator

and Coil 2 opens the actuator. If the actuator is opening or closing, changing the status of coil 1 or 2 from a value of

1 to 0 will stop the actuator (the coil will automatically be set to zero when the actuator reaches the full open or full

close position).

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

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

performance.

NOTE: See Bulletin LMAIM1329, Accutronix Installation and Operation for MX-DDC Field Unit to conﬁgure AS and

AR Relays for DDC control.

Table 2.5 – 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.

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 65 66

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