WX16 User Manual | 37
3.1.6 Optional 4-20mA Analog Output Board
#10-0167
An optional 10 bit 4-20mA analog output board, shown in Figure 3.7, may be
connected to the I
2
C bus. Each channel’s output will transmit 4mA for 0% readings and
20mA for 100% readings. Loop drive capability depends upon the level of the WX16’s
primary DC power supply. With at least 20 volts DC primary power, they 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. Note: This PCB requires nominal 24
VDC power be connected to TB2 terminals 1 & 2 as shown in Figure 3.7. Suitable
power is available from the WX16 Main I/O board’s TB2 terminal 10 & 12 (see Figure
3.1).
Since the PCB has 8 channels, two are required for 16-channel applications. JP1
configures the outputs for channels groups 1-8 or 9-16.
Figure 3.7
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