2-5 Installation & Wiring
Controller Input Wiring
Input Terminals
Hardware inputs can be used to select a program of setpoints, disable keypads, accept
sensor signals, or clear the shift register. The 16 inputs on the PS-6244 are arranged
on two terminal strips, TB 1 and TB 3, as shown in Figure 7. Each input is optically
isolated and can be powered from an external DC power source or the Auxiliary Power
terminals located on TB 2.
Sinking or Sourcing
Each terminal strip TB 1 and TB 3 can be wired to accept sinking or sourcing input
signals, but all eight inputs on that strip will require the same type of signal. Many types
of hardware can drive these inputs, including mechanical switches, relay contacts, DC
3-wire sensors, solid state DC output modules, and PLC DC outputs. 2-wire DC sen-
sors can also be used, but may require a load resistor in parallel with the input. Typical
wiring diagrams are shown in Figure 7.
Input Functions
Following are the input terminals and their corresponding functions:
Channel Enable (1-8)
These terminals accept signals from sensors or from PLC’s. Each output channel on
the 6244 can be ANDed with any one of these inputs so that the output is enabled only
when a signal is present on the input terminal.
Program Select (9-13)
The on/off status of these terminals selects which program of setpoints is controlling
the outputs. Binary, BCD, or Gray Code formats can drive these terminals as shown in
Figure 8. Although standard controllers can store up to 48 programs, not all of these
programs can be selected through the Program Select terminals.
When all program select inputs are off, the “Default” program will become active as
programmed through DEFAULT PROGRAM function.
Shift Register Clear (14)
A signal on this terminal will completely clear the shift register for all output channels.
Keypad Disable (15)
When energized, this terminal disables any keypads connected to the controller. If the
controller will be used without any keypads, jumper this terminal so that it is always
energized.
Shift Register Input (16)
The leading edge of a signal on this terminal sets a bit in the shift register. See SHIFT
REGISTER ANDING for details.
