SRC16 and Turnout Feedback

Turnout (switch) feedback generally refers to confirming that a turnout actually moved or changed states after is was commanded to do so. Most DCC systems have the capability to control turnouts by using accessory or stationary decoders. When a turnout command is issued to the accessory decoder it is assumed that it changed the state of the turnout. In some cases it may be desirable to confirm that the turnout actually moved or changed states. This is when feedback is used.

The actual wiring to the SRC16 is shown using three examples of feedback: a Tortoise™ contacts, a Peco PL-13 accessory switch and a DCC Specialties Hare™. The SRC16 inputs are connected to the feedback device using TSAs which provide screw terminals. The outputs of the SRC16 are driving position LED indicators connected to TSAs which have built-in resistors (the resistors do not effect the SRC16 inputs). The LEDs indicate which state the turnout is in based on the actual position of the turnout. In reality this only confirms the accessory decoder controlled the switch machine.

src16 turnout fb wiring