Discrete Inputs

The discrete inputs are the switch input commands to the MSLC. Discrete inputs

are optically isolated from the control and require 10 mA at 24 Vdc each to

activate. Discrete inputs may be powered by the same source as control power.

All contacts used in the discrete circuits should be the isolated dry contact type to

work properly with the low currents used in these circuits.

Connect the 24 Vdc supply common (–) to terminal 43. Route +24 Vdc through

the appropriate external contact to the discrete input.

Synchronizer Mode Switch

The synchronizer mode switch (single-pole, four-position) controls the operating

mode of the synchronizer. The switch must be wired to terminals 44. 45. and 46.

as shown in Figure 1-3. The four positions are Off, Check mode, Permissive

mode, and Run mode. When the switch is off, the synchronizer is out of operation.