Stagehand Apprentice 2: Sensor Input
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The Signal Cable is shared between the Stagehand Apprentice and Stagehand Pro controllers, although the Stagehand Apprentice doesn't utilize all of the inputs.
The 24-pin Sensor Input receptacle includes signal inputs for the following sensors on the Stagehand Apprentice:
Limit signals are designed as fail-safe inputs. To allow movement in the corresponding direction, an electrical signal must be present. If the signal is interrupted, motion will stop. Limit switches should be wired Normally-Closed (N.C.) for failsafe operation.
3
+24VDC
4
Reverse Limit Signal
5
+24VDC
6
Forward Limit Signal
A Normally Closed (N.C.) switch can be wired into either the Forward or Reverse Limit inputs. If the limit switch is activated, the Stagehand will not allow further motion in the whatever direction the limit is struck until the limit is cleared by any of the following means:
moving in the opposite direction far enough to clear the limit switch
adjusting the switch mechanically
pressing the Forward or Reverse Limit Override Button if it is safe to do so
19
Position Encoder - A
20
Position Encoder - /A
21
Position Encoder - B
22
Position Encoder - /B
23
+12VDC
24
COM (0VDC)
GND
Shield
The Stagehand Apprentice 2 only uses a single encoder.
Encoder requirements:
12VDC tolerant
Incremental quadrature encoder signal
Differential line drivers: A, /A, B, /B
The Position Encoder provides feedback to the Stagehand Card to track the position of the machine or scenery. It is actively used to run cues, and it is constantly monitored to track the position of the machinery or scenery at all times. However, it is not actively used during manual operation (aka jogging). This allows for manual operation in case of a position encoder failure.
(to prevent overtravel of a machine)