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20 DDC-100 Direct-to-Host Programming Guide FCD LMAIM4019-00 FCD LMAIM4019-00 DDC-100 Direct-to-Host Programming Guide 21

Modbus function code 06 command values for controlling the DDC-100 Field Unit are given in Table

3.7. Each command should be issued only one time for the desired ﬁeld unit control. Repeated

issuance of an acknowledged command will degrade network performance.

The normal response to the (06) command is an echo of the command.

NOTE:

1) Only use values listed in table 3.7 For ﬁeld unit register 40001.

2) Field Unit Register 40002 should only be used for “move-to” position input.

3) The Host MUST issue “move-to” commands in the proper sequence. Failure to issue this

two-step command in the correct sequence will result in the ﬁeld unit waiting for the proper

command sequence execution before performing the “move-to” function.

4) The “move-to” command should only be used with ﬁeld units that include the position control

option.

5) Do not write to Field Unit Registers 5-16.

Table 3.7 – Modbus 06 Command and Field Unit Holding Register 40001

Host Commands to

Field Unit Register 1

Value

(dec.)

MX-DDC UEC-3-DDC DDC-100

Clamshell

I/O Module

Null Command 0 Yes Yes Yes Yes

Open 256 Yes Yes Yes Do Not Use

Stop 512 Yes Yes Yes Do Not Use

Close 768 Yes Yes Yes Do Not Use

Start Network ESD 1280 Yes Yes Yes Do Not Use

Stop Network ESD 1536 Yes Yes Yes Do Not Use

Engage Relay #1 2304 Yes (AS-1) Do Not Use Do Not Use Yes, K21

Engage Relay #2 2560 Yes (AS-2) Do Not Use Do Not Use Yes, K12

Engage Relay #3 2816 Yes (AS-3) Yes Yes Yes

Engage Relay #4 3072 Yes (AS-4) Do Not Use Yes Yes

Engage Relay #5 3328 Yes (AR-1) Do Not Use Yes Yes

Engage Relay #6 3584 Yes (AR-2) Yes Yes Yes

Engage Relay #7 3840 Yes (AR-3) Do Not Use Do Not Use Do Not Use

Disengage Relay #1 4352 Yes (AS-1) Do Not Use Do Not Use Yes, K21

Disengage Relay #2 4608 Yes (AS-2) Do Not Use Do Not Use Yes, K12

Disengage Relay #3 4864 Yes (AS-3) Yes Yes Yes

Disengage Relay #4 5120 Yes (AS-4) Do Not Use Yes Yes

Disengage Relay #5 5376 Yes (AR-1) Do Not Use Yes Yes

Disengage Relay #6 5632 Yes (AR-2) Yes Yes Yes

Disengage Relay #7 5888 Yes (AR-3) Do Not Use Do Not Use Do Not Use

Move-To (enable) 6656 Yes Yes Yes Do Not Use

Note 1: Engage and disengage Relay #1 control physical Relay K2.

Note 2: Engage and disengage Relay #2 control physical Relay K1.

Do Not Use–This command is not intended for use in this conﬁguration.

Other registers may also be preset to control or change other functions but care must always be taken to

properly change these values. An improper value written to a register can cause undesirable actions from the

DDC-100 Field Unit.

NOTE: Null Command–The ﬁeld unit takes no action when this command is received. This command is

typically used by a Host to reset the Host output register when required.

Example of Field Unit Command

Write the command to open an actuator (actuator open) to ﬁeld unit number 179. This corre-

sponds to writing the value 256 into ﬁeld unit register 40001.

Query: B306000001009388

Response: B306000001009388

Message Breakdown

Query Response

B3 Slave (Field Unit) Address B3

Slave (Field Unit)

Address

06 Function 06 Function

00 Register Address Hi 00 Register Address Hi

001 Register Address Lo 00 Register Address Lo

01 Force Data Hi 01 Preset Data Hi

002 Force Data Lo 00 Preset Data Lo

9388 Error Check (CRC) 9388 Error Check (CRC)

Note 1: 0000h equals Register Address 40001 (ﬁeld unit register 1, command register).

Note 2: 0100h requests the register to be preset with 256 Decimal (engage open contactor).

Example of “Move-To” Command

Move an actuator at address 179 to 42% of open by ﬁrst writing the value of 42 to the ﬁeld unit

40002 register. After receiving a response from the ﬁeld unit, write the value of 6656 to the ﬁeld

unit 40001 register. The actuator will then move to a position of 42% of open.

First Command

Query: B3060001002A4207

Response: B3060001002A4207

First Command Message Breakdown

Query Response

B3 Slave (Field Unit) Address B3

Slave (Field Unit)

Address

06 Function 06 Function

00 Register Address Hi 00 Register Address Hi

011 Register Address Lo 01 Register Address Lo

00 Force Data Hi 00 Preset Data Hi

2A2 Force Data Lo 2A Preset Data Lo

4207 Error Check (CRC) 4207 Error Check (CRC)

Note 1: 001h equals Register Address 40002 (ﬁeld unit register 2, argument register).

Note 2: 002Ah equals 42.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 32 33

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