Wiring for Dencytee Arc Total Cell Density Sensors
Dencytee Arc total biomass sensors come standard with Modbus RTU (RS485) digital protocol. The output signal can be used to communicate with ArcAir software on a personal computer (PC) or laptop or directly connected to a process control system (PCS) that accepts a digital signal. Like all other Arc intelligent sensors, Dencytee Arc can also be connected through a Wi 2G Wireless Bluetooth adapter (Ref 243470). Examples of each wiring connection are provided below.
Connection to PC
Direct connection to a PC is accomplished using the VP8 Arc USB Power Cable (Ref 243490-01). If connection with the sensor through the Wi 2G Wireless Bluetooth Adapter is desired, use the M12 Arc USB Power Cable (Ref 243490-02).
Wiring to PCS (4-20 mA and Modbus)
The addition of the Wi 2G Wireless Bluetooth Adapter adds wireless communication to the Dencytee Arc sensor. In addition, the adapter enables two passive 4-20mA outputs. The Wi 2G Adapter also provides galvanic isolation for the analog outputs thus is a good choice for PLCs and other devices that lack their own isolation of the input circuit.
The wiring between the Wi 2G Wireless Bluetooth Adapter and the control system is shown below. An M12 8-pole Data cable should be chosen. Cable options are as follows: Ref 355320 (3M length), Ref 355321 (5M length), Ref 355322 (10M length).
| M12 Pin | Function | Color | Description |
|---|---|---|---|
| 1 | +4-20 mA # 1 | White | 4-20 mA two-wire interface, functions as a current sink and needs to be powered. It regulates the input current according to the sensor measurements and galvanically isolated from the power supply. |
| 2 | -4-20 mA # 1 | Brown | Same as above |
| 3 | +4-20 mA # 2 | Green | Same as above |
| 4 | -4-20 mA # 2 | Yellow | Same as above |
| 5 | RS485 (A) | Gray | Modbus RTU RS485 |
| 6 | RS485 (B) | Pink | Modbus RTU RS485 |
| 7 | GND | Blue | Ground |
| 8 | + 24 VCD | Red | Power supply: +10 V to +27 V (Power supply can be external; not from PCS) |
| Housing | Shield | Green/Yellow | Connected to the housing including the VP8 female connector |
For an active 4-20 mA input, the following wiring diagram should be referenced
For a passive 4-20 mA input, the following diagrams should be referenced:
If the sensor is the current source:
If the sensor is the current sink:
Wiring to PCS (Modbus only)
The simplest form of connecting Dencytee Arc is using the native Modbus signal to communicate directly with the control system. In this case, the Modbus registers must be set up in the control system to perform the proper read/write functions. Cable options are as follows: Ref 355263 (1M length), Ref 355264 (3M length), Ref 355265 (5M length), Ref 355266 (10M length).
| VP Pin | Function | Color Double Coaxial Cable | Color Data Cable |
|---|---|---|---|
| A | Not used | Coaxial core black transparent | Yellow |
| B | Not used | Coaxial shield black | Green |
| C | Power supply: +10 V to 27 V | Coaxial core red transparent | Red |
| D | Power supply: Ground | Coaxial shield red | Blue |
| E | Not used | White | Brown |
| F | Not used | Green | White |
| G | RS485 A | Yellow | Gray |
| H | RS485 B | Brown | Pink |
| Shaft | Sensor shaft connected to earth | Green/Yellow | Green/Yellow |
If wiring multiple Dencytee Arc sensors together for Modbus connection to the PCS, each sensor functions as a Modbus slave. An example multi-drop bus wiring diagram is shown below.
More information on programming Dencytee Arc can be found in the Progammers Manual.
Related Content:
See how to properly setup and Install your Dencytee Arc sensor.
Discover the different Arc Wi Adapters.
Find more information about Total Cell Density Sensors.