Inputs And Outputs; Connecting Standard Inputs - KMC Controls FlexStat Application Manual

Inputs and Outputs

Connecting Standard Inputs

Supported input devices include:
• Active 0–12 VDC devices
• Passive contacts
• 10K ohm thermistors (Type III or Type II can be selected using the
Inputs menu)
Unsupported input devices include:
• 1K ohm RTDs
• Directly connected 4–20 mA devices—but they can be connected as
voltage inputs across an external resistor (see below for information)
Passive input devices require pull-up resistors, which can be switched
on inside the thermostat. For passive input devices (e.g., switch contacts
and 10K ohm thermistors), set the pull-up switch on the back of the cir-
cuit board to the 10K position. For active voltage devices, set the switch
to the 0–12 VDC position.
Be sure pull-up resistor switches are set correctly. Having both pull-up
switches to the left can potentially result in oscillating readings that can
even affect other inputs. Having both to the right may result in readings
that are only about 1/4 the proper value.
NOTE: ALL the input pull-up resistor switches must be fully latched
in the correct positions. See the Connections and Wiring section
of the relevant FlexStat Installation Guide. A single incorrect
switch position may affect multiple inputs. All input
switches must be latched in either 10K Ohm or 0–12 VDC
positions even if no input is connected! Input switch pairs
must never have both switches set to the left or both to the
right—if one of the switch pairs is set to the left, for example,
the other must be set to the right (or vice versa).
NOTE: Analog inputs can be mapped as binary values in Control Basic
(using BACstage or TotalControl). Set an analog voltage less
than 0.5 VDC to equal a binary Off state and an analog voltage
of 0.5 to 12 VDC to equal a binary On state. See
Analog Inputs or Outputs as Binary on page
FlexStat (General)
NOTE: See also the terminal illustrations for:
• BAC-1xx63/1xxx63 Series (6 Relays and 3 Analog Outputs) on page
• BAC-1xx36/1xxx36 Series (3 Relays and 6 Analog Outputs) on page
Mapping
• BAC-1xx30 Series (3 Relays and 0 Analog Outputs) on page
15.
5
Input Pull-Up Switches
Ω
0-12 V
10K
IN9
IN8
IN7
IN4
IN3
Pushed Left
IN2
Pushed Right
BAC-1xxxxx EOL and Pull-Up Resistor Switch Positions
Pushed Left
EOL =
1
OFF ON
2
1 1
3
2 2
4
5
IN3 =
Ω 6
10K 0-12 V
5 5
7
6 6
8
(Older) BAC-1xxxx EOL and Pull-Up Resistor Switch Positions
EOL
Switches
OFF ON
Pushed Right
IN4 =
Ω
10K 0-12 V
3 3
4 4
IN2 =
Ω
10K 0-12 V
7 7
8 8
55.
Application Guide, Rev L
27.
46.