The DCL series actuators support the Modbus-RTU protocol. By referring to this application manual, you can connect the DCL actuator to Modbus.

Panel Description

1. Sąsajos apibrėžimas

• P1: 220VAC Neutral (N)

• P2: 220VAC Live (L)

• P3: 4-20mA Input –

• P4: 4-20mA Input +

• P5: 4-20mA Output –

• P6: 4-20mA Output +

• P7: RS485 A

• P8: RS485 B

2. Buttons

• Open: In “Setup Mode” (when switch SA points to “2”), pressing this key opens the actuator, and releasing it stops the motor. Pressing Nustatyti and Atidaryti simultaneously is used for full-open position calibration.

• Shut: In “Setup Mode,” pressing this key closes the actuator, and releasing it stops the motor. Pressing Nustatyti and Uždaryti simultaneously is used for full-close position calibration.

• Set: Used in combination with Atidaryti and Uždaryti in “Setup Mode” to perform specific functions.

3. Selector Switch

• SA: Selects the input signal’s direct/reverse action mode and setup state. It must be set while powered on for it to be effective. Factory default is 1:

  • 1 – Direct Action

  • 2 – Setup Mode

  • 3 – Reverse Action

• SB: Sets the safety position. When an external control signal is lost, the actuator moves to the specified position. Factory default is 2:

  • 1 – Move to Full Open

  • 2 – Hold Current Position

  • 3 – Move to Full Close

  Pastaba: When using Modbus control, SB must be set to position 2.

4. Deadband Value Adjustment Potentiometer

• Adjusts the deadband value. Turning clockwise increases the deadband; counterclockwise decreases it. The range is 0.5% – 5.0% (factory default is 1.5%).

5. Indicator Lights

• L1 (Green): Power Indicator – Lights up when power is supplied.

• L2 (Red): Input Signal Failure Indicator – Lights up when input signal fails.

• L3 (Red): Position Detection Failure Indicator – Lights up if the position potentiometer is open, shorted, or damaged.

• L4 (Red): Jamming Failure Indicator – Lights up when jamming occurs.

Settings

To enter “Setup Mode,” set Pietų Afrika to position 2. This mode allows for:

• Travel calibration

• Input signal failure handling

• Deadband value adjustment

• Manual operation

• Output current calibration

1. Setting End-position

• Setting End-position of Close: Adjust the valve to the end-position of close using Atidaryti and/or Uždaryti buttons. Press Nustatyti, then Uždaryti, and hold both for about 4 seconds until L2 lights up, then release both buttons. L2 turns off, indicating setting completion.

• Setting End-position of Open: Adjust the valve to the end-position of open  using Atidaryti and/or Uždaryti buttons. Press Nustatyti, then Atidaryti, and hold both for about 4 seconds until L2 lights up, then release both buttons. L2 turns off, indicating setting completion.

2. Setting Modbus Address

• The Modbus communication address and baud rate can be modified via Modbus commands.

• Factory default address: 1

• Factory default baud rate: 9600

3. Deadband Value Adjustment

• Turning the potentiometer clockwise increases the deadband.

• Turning it counterclockwise decreases the deadband.

• Each tick mark corresponds to a 0.5% change.

• If set below 0.5%, it is automatically processed as 0.5%.

• In Setup Mode, use Atidaryti or Uždaryti to manually open or close the valve.

Operation

To start automatic operation, set Pietų Afrika to position 1 or 3.

• Upon power-up, the actuator defaults to 4-20mA signal control.

• Sending a Modbus command switches the actuator to communication control mode.

• After power cycling, the actuator returns to analog control mode.

Important: When using Modbus control:

• Ensure SB is set to position 2.

• Every control command must include the control mode and position value to prevent unintended actions after a restart.

Using 4-20mA for Position Control

Pastaba:

• In reverse action mode, 4mA corresponds to 100% openir 20mA corresponds to 0% open.

• Servo controller accuracy level: ±1%

• Hysteresis: <1%

Using Modbus to Control Actuator Position

Physical Layer

The DCL actuator supports the Modbus-RTU protocol and uses the RS485 interface at the physical layer.

• Communication Address: Configurable from 1 to 127, default is 1.

• Baud Rate: Configurable, default is 115200.

• Serial Port Format: 1 start bit + 8 data bits + 1 stop bit.

• Broadcast Functionality: Supported.

Interface Definition

Modbus Wiring Diagram

Taikymo sluoksnis

1. ADU (Application Data Unit)

2. Funkcijų kodai

3. Configuring Communication Parameters

Registers 0x0040 – 0x0042 are used for communication settings:

1. Write 0xA501 to register 0x0040 to enter configuration mode.

2. Modify register 0x0041 (communication address) and register 0x0042 (baud rate).

3. The new parameters take effect within 1 second, and further communication must use the updated settings.

4. Exit configuration mode by writing 0x0000 į register 0x0040.

4. Forcing Default Communication Mode

1. Nustatyti Pietų Afrika į position 2 and SB į position 2.

2. Press and hold the KS button for about 3 seconds until the red light blinks, then release the button.

3. Press and hold the KC button for about 3 seconds until the red light stays on, then release the button.

4. The communication parameters are now reset to default values.

5. Nustatyti Pietų Afrika back to position 1 to exit this mode.

6. The new settings remain even after restarting the device.

Pastaba:
If you forget the previous communication parameters, use this method to restore the default communication mode and configure the communication settings again.

Register List

Communication Command Examples

1. Control Valve Position

Entering Communication Control Mode:
Send → ◇01 10 00 10 00 01 02 00 01 65 00
Receive ← ◆01 10 00 10 00 01 00 0C

Setting Valve Position: 0%
Send → ◇01 10 00 11 00 01 02 00 00 A5 11
Receive ← ◆01 10 00 11 00 01 51 CC

Setting Valve Position: 50% (5000 → 0x1388)
Send → ◇01 10 00 11 00 01 02 13 88 A8 47
Receive ← ◆01 10 00 11 00 01 51 CC

Setting Valve Position: 100% (10000 → 0x2710)
Send → ◇01 10 00 11 00 01 02 27 10 BF 2D
Receive ← ◆01 10 00 11 00 01 51 CC

Stopping Operation
Send → ◇01 10 00 10 00 01 02 00 11 64 CC
Receive ← ◆01 10 00 10 00 01 00 0C

2. Read Valve Status

Send → ◇01 03 00 18 00 02 44 0C
Receive ← ◆01 03 04 00 30 00 00 FA 3C

3. Set Communication Address

Entering Configuration Mode:
Send → ◇01 10 00 40 00 01 02 A5 01 12 00
Receive ← ◆01 10 00 40 00 01 00 1D

Change Communication Address to: 2
Send → ◇01 10 00 41 00 01 02 00 02 28 80
Receive ← ◆01 10 00 41 00 01 51 DD

Exit Configuration Mode:
Send → ◇02 10 00 40 00 01 02 A5 00 C7 30
Receive ← ◆02 10 00 40 00 01 00 2E

4. Set Communication Baud Rate

Entering Configuration Mode:
Send → ◇01 10 00 40 00 01 02 A5 01 12 00
Receive ← ◆01 10 00 40 00 01 00 1D

Change Baud Rate to: 9600
Send → ◇01 10 00 42 00 01 02 00 01 68 B2
Receive ← ◆01 10 00 42 00 01 A1 DD

Exit Configuration Mode:
Send → ◇01 10 00 40 00 01 02 A5 00 D3 C0
Receive ← ◆01 10 00 40 00 01 00 1D