CLS200 Series User’s Guide
Chapter 8: Troubleshooting and Reconfiguring
157
Sixteen-Loop Input Circuit
Sixteen-loop controllers can accept single-ended thermocouple, mVDC, VDC and mA DC inputs.
Unless ordered with special inputs, the controller accepts only signals within the standard range of
-10 to 60mVDC.
To accommodate other signals, the input circuit must be modified. When configured for
thermocouple inputs, 0Ω resistors are installed in all RC locations. To accommodate milliamp current
signals or voltage signals outside the standard range, resistors are added or replaced to scale the
signals to the standard range.
Figure 8.10 shows the schematic for one single-ended sensor input to sixteen-loop controller.
See Current Inputs to Sixteen-Loop Controllers on page 157 and Voltage Inputs to Sixteen-Loop
Controllers on page 158 for specific instructions and resistor values for voltage and current inputs.
IN +
RD
Analog
Input
Terminals
RC
Com
To CLS200
Circuitry
(Voltage only)
(Voltage and Current)
Measurement
Figure 8.10 — Single-Ended Input Circuit in Sixteen-Loop Controllers
Current Inputs to Sixteen-Loop Controllers
Each current input has a 3.0Ω resistor in the RD location for the input.
Table 8.12 — Resistor Values for Current Inputs to Sixteen-Loop Controllers
INPUT RANGE RESISTOR VALUE RD
0 to 20mA 3.0Ω
Resistor tolerance: ±0.1%
Table 8.13 — Resistor Locations for Current Inputs to Sixteen-Loop Controllers
LOOP RESISTOR LOCATION RD LOOP RESISTOR LOCATION RD
1 R42 9 R41
2 R40 10 R39
3 R38 11 R37
4 R36 12 R35
5 R34 13 R33
6 R32 14 R31
7 R30 15 R29
8 R28 16 R27
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