Johnson Controls SNC Series User Manual

Figure 8: SNC inputs
Figure 9: SNC outputs
Note: The SNC has two sets of 24+ and common terminal block connections amongst the output pins (Label
numbers 19, 20 and 25, 26). The 24 V connection (Label numbers 20 and 26) is the same as the 24V~ HOT connection
(Label number 02) and the COM connections (Label numbers 19 and 25) are the same as the 24VAC~ COM
connection (Label number 01). These extra power connections can be used to jumper power for switched high
(externally sourced) or switched low (externally sourced) Triac loads.
Table 5: Input and output terminals
Type of Point Options
Universal Inputs • Voltage Analog inputs (0-10 VDC)
• Current Analog inputs (4-20 mA)
• Resistive Analog inputs (0-2k Ohm)
- RTD: 1k Nickel, 1k Platinum, or A99B SI
- NTC: 10k Type L or 2.225k Type 2
• Dry contact Binary inputs
Binary Inputs • Dry contact maintained
• Pulse counter mode (100 Hz)
Configurable
Outputs
• Voltage Analog outputs (0-10 VDC)
• Binary Outputs (24 VAC Rated Triac)
Analog Outputs • Voltage Analog outputs (0-10 VDC)
• Current Analog outputs (4-20 mA)
Binary Outputs 24 VAC Rated Triac
Terminal functions, ratings, requirements, and wiring guidelines
Input and output wiring guidelines
The following table provides information and guidelines
about the functions, ratings, and requirements for
the SNC input and output terminals and references to
guidelines for determining proper wire sizes and cable
lengths.
In addition to the wiring guidelines in the following table,
observe these guidelines when wiring inputs and outputs:
• Run all low-voltage wiring and cables separate from
high-voltage wiring.
• Ensure all input and output cables, regardless of wire
size or number of wires, consist of stranded, insulated,
and twisted copper wires.
• Shielded cable is recommended but not required for
input or output cables.
• Shielded cable is recommended for input and output
cables that are exposed to high electromagnetic or
radio frequency noise.
• Inputs/outputs with cables less than 30 m (100 ft) do
not require an offset in the software setup. Cable runs
over 30 m (100 ft) may require an offset in the input/
output software setup.
Terminal wiring and cable length
guidelines
F4-SNC Installation Guide8

Johnson Controls SNC Series Specifications

General

Brand	Johnson Controls
Model	SNC Series
Category	Controller
Language	English