X20105 Components and Spares | Automation Control System

9 Channel HMI

D/A Signal Controller System Installation & User Manual

BMF House - Wight Moss Way,

Southport Business Park

Southport PR8 4HQ

ENGLAND, UNITED KINGDOM

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14 July 2025 | Issue: 5

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3 of 4

Connect the analogue output signals of the D/A units to the signal input connections of the equipment being controlled. The "-"

output terminals, on each D/A in the system are connected together and are also connected to the 24VDC system supply

ground. If an external DC supply is used to power the system, the DC supply -ve is also connected the system ground and

hence also the analogue output "-" terminals. The complete system including the equipment being controlled should have a

common ground connection.

If the system is being powered by a mains AC supply, connect the supply to the "AC IN" terminals on one of the D/A units in the

system

If the system is being powered by a 24VDC supply, connect the supply to the "DC IN" terminals.

NOTE: A SINGLE POWER SOURCE, EITHER AC OR DC, SHOULD BE CONNECTED TO ONLY ONE D/A UNIT

The system should be fused externally, the typical power consumption is 30mA@24VDC per unit (HMI or D/A).

HMI UNIT DESCRIPTION

The HMI unit provides buttons to allow control of the connected D/A units output channels and 7 segment LED displays to

display the selected channel and its power level. The HMI unit auto detects the connected D/A units and will only allow valid

channels to be selected.

The HMI unit has the following buttons:

CHANNEL+

Increment channel selection (1 to 9)

CHANNEL -

Decrement channel Selection (1 to 9)

CHANNEL OFF

Switch off Current Channel

ALL ON/OFF

Switch ON or OFF all channels (Toggle)

LEVEL +

Increment Current Channel Power Level: 0 to 99, F (Fully on)

LEVEL -

Decrement Current Channel Power Level (0 to 99)

The HMI unit has the following 7 segment displays:

CHANNEL

Single digit, indicates the currently selected channel (1-9)

LEVEL

Two digits, displays the level of the currently selected channel.

Each level step represents 50mV, e.g. a level of 50 is equivalent to an output

voltage of 50 x 50mV = 2.5V

The HMI unit has the following terminal connections:

"-"

DC power supply negative connection

"+"

DC power supply positive connection: 24VDC

"A"

RS485 interface A leg

D/A UNIT DESCRIPTION

The D/A unit receives messages from the HMI master unit and sets the analogue output levels to the level requested by HMI

unit. The D/A slave unit also acknowledges the message from the HMI unit so that the HMI unit knows that the addressed D/A

unit has received and decoded the message.

The D/A unit has the following terminal connections:

AC Supply Input (L and N)

Single Phase Supply, Live (L) and Neutral (N) connections.

100-240V AC +/-10%, 50/60Hz.

DC Supply Input (+ and -)

DC IN, 24VDC Supply, positive and negative connections.

HMI CONNECTION "+"

Positive power supply, 24VDC, power connection to all other

units in the System.

HMI CONNECTION "-"

Negative power supply, ground connection to all other units in

the system.

HMI CONNECTION "A"

RS485 A leg to all other units in the system.

HMI CONNECTION "B"

RS485 B leg to all other units in the system.

Analogue Outputs

3 x Analogue Channels: CH1 "+", CH1 "-", CH2 "+", CH2 "-",

CH3 "+", CH3 "-". The "-" terminals are common and also

connected to the system DC ground.

The D/A unit has the following switch for slave unit address configuration:

SW1

4 Way DIL Switch for D/A channel configuration, only switch

positions 3 and 4 are used.

The D/A unit has the following LED indicators:

POWER

Green LED indicating that the unit is powered

DATA

Orange LED, which flashes when the D/A unit is

communicating with the HMI unit.