Johnson Controls SNC Series - Page 9

Table 6: Terminal wiring
Terminal block label Terminal labels Function, ratings, and
requirements
Determine wire size and
maximum cable length
+15 V 15 VDC Power Source for active
(3-wire) input devices connected
to the Universal UI-# terminals.
Provides 100 mA total current.
Same as Universal inputs UI-#
Note: Use a 3-wire cable
for devices that source
power from the +15 V
terminal.
Analog Input - Voltage Mode
(0–10 VDC)
10 VDC maximum input voltage
Internal 110k Ohms Pulldown.
See Guideline A in Table 7.
Analog Input - Current Mode
(4–20 mA)
Internal 100 Ohms load
impedance.
See Guideline B in Table 7.
Analog Input - Resistive Mode
Internal 12 V, 15k Ohms pull up.
Qualified Sensors: 0–2k
potentiometer, RTD (1k Nickel
[Johnson Controls sensor], 1k
Platinum, and A99B Silicon
Temperature Sensor) NTC Sensor
(10k Type L, 10k JCI Type II,
2.252k Type II).
See Guideline A in Table 7.
UI-#
Binary Input - Dry Contact
Maintained Mode
1 second minimum pulse width
Internal 12 V, 15k Ohms pull up.
See Guideline A in Table 7.
UNIVERSAL
(Inputs)
UI-C# Universal Input Common for all
Universal input terminals
Note: All Universal UI-C#
terminals share a common,
which is isolated from all
other commons.
Same as (Universal) UI-#.
Binary Input - Dry Contact
Maintained Mode
0.01 second min. pulse width.
Internal 17 V, 3k Ohms pull up.
BI-#
Binary Input - Pulse Counter/
Accumulator Mode
0.01 second min. pulse width.
(50 Hz at 50% duty cycle).
Internal 17 V, 3k Ohms pull up.
BINARY
(Inputs)
BI-C# Binary Input Common for all
Binary Input terminals
See Guideline A in Table 7.
F4-SNC Installation Guide 9