User manual

Publication 1760-UM001A-EN-P

Installation 2-13

Figure 2.6 20 mA Sensors

Connect 4 to 20 mA (0 to 20 mA) sensors using an external 500Ω resistor, as

shown above. The resultant impedance to the sensor is then approximately 478

Ω.

The following values result (Based on V = R x I = 478Ω x 10 mA = 4.8V dc):

• 4 mA = 1.9V dc

• 10 mA = 4.8V dc

• 20 mA = 9.5V dc

Connecting Outputs

The Q output terminals function as isolated contacts, as shown below.

Relay coils are controlled via the corresponding output relays Q1 to Q4 or Q1 to

Q6. You can use the signal states of the output relays as make or break contacts in

the Pico program to provide additional logic conditions.

The relay outputs are used to switch loads such as fluorescent tubes, filament bulbs,

contactors, relays or motors. Check the technical thresholds and output data before

installing such devices (see Relay Outputs on page A-5).

+24V

500Ω

4 to 20 mA

24V dc

+24 V COM I2 I3 I4 I5 I6 I7 I8I1

Inputs x 24V dc (I7,I8 0 to 10V)