WX16 User Manual | 29
terminals per channel for distributing power and receiving analog inputs. These are
EXC
and
HI
/
LO
inputs. TB2, with only two positions, is for connecting the power
supply for powering external transmitters. Precision 100 ohm resistors (R1 – R8)
between each channel’s
IN LO
and
IN HI
terminals are socketed termination resistors
for 4-20mA inputs. These may be removed if voltage inputs are to be applied.
EXC
and
IN LO
terminals are bussed together internally.
EXC
terminals are tied
directly to TB2-1 (+) and
IN LO
terminals are tied to TB2-2 (-). Bussing allows
transmitter power to be brought into the system at a single point (TB2) and distributed
back out at each channel’s
EXC
/
IN LO
terminals to simplify field wiring. Figure 3.3
includes typical wiring to 2- & 3-wire 4-20mA transmitters.
JP1 determines if the 8 analog inputs are applied to channels 1-8 or channels 9-16.
Connecting more than 8 analog inputs requires 2 PCB’s with one JP1 set for channels
1-8 and the other set for channels 9-16.
Summary of Contents for WX16
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