Honeywell HA40 technical manual Optional 4-20mA Analog Output Board

3.1.4 Optional 4-20mA Analog Output Board

(P/N 10-0308)

An optional 4-20mA analog output board, shown in Figure 3-6, may be added. Each channel’s output will transmit 4mA for 0% readings and 20mA for 100% readings. Make certain that the mA loop output is set to LATCHING on reading devices connected to the HA40.

If the HA40 primary power is 100 – 240 VAC, 4-20mA outputs are capable of driving 20mA through a 750 ohm load. Outputs are self powered and DC power should not be provided by the receiving device. Precision calibration of the 4-20mA output DAC (digital to analog converter) is accomplished via the Analog Setup menu as described in Section 2.3.4.

Figure 3-5. Optional Discrete Relay PCB’s (P/N 10-0222)

Optional 4-20mA Outputs Notes

4-20mA Outputs are sourcing and

24 VDC power must not be supplied by the receiver device

Loop Drive capability is 750 ohms with nominal 85-240 VAC power or 24 VDC power as the Controller primary power supply.

Make certain that the mA loop output is set to LATCHING on reading devices connected to the HA40.