C1 Controller Users Manual
Revision 4.6
23
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’s JP1 set for channels
1-8 and the other set for channels 9-16.
R2
R1
ANALOG INPUTS
R3
R4
R7
R6
R5
+EXC-
DC PWR
TB2
R8
JP1
ST-71 ANALOG INPUT BOARD
0010-1115 ASSY# 10-0158
J2
J1
J1 & J2 are interchangable I2C
connectors used to add option
PCB assemblies to the ST-71.
JP1 determines if this 8 channel
Analog Input PCB provides inputs
for CH’s 1-8 or 9-16. 2 PCB
assemblies are required for 16
channels.
Socketed precision resistors R1-R8
are 100 ohm terminations for 4-20mA
inputs. 0-2 VDC voltage inputs may
be accepted by removing resistor.
TB2 is for powering bulk power to transmitters
or other powered input devices. EXC+ is
wired internally to channel “EXC’s” and EXC-
to channel “LO’s”.
CH1/9
EXC
HI
CH7/15
HI
EXC
CH3/11
EXC
LO
HI
LO
CH5/13
LO
HI
EXC
LO
CH2/10
HI
EXC
CH8/16
CH4/12
EXC
LO
HI
LO
EXC
CH6/14
EXC
LO
HI
LO
HI
8 Channel Analog Input Option #10-0158
EXC
LO
HI
2 Wire 4-20mA
Transmitter
+Pwr
Sig
3 Wire 4-20mA
Transmitter
EXC
LO
HI
+Pwr
Sig
Com
Typical 2 & 3 wire 4-20mA
transmitter wiring (connect
correct power, 24VDC or
other, to TB2).
CH # (1-8)
CH # (1-8)
Figure 3.3
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