Riley & Associates, Inc.

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Monorail Control Products


Open Collector OUT BOARD


This controller board utilizes a 120 V.A.C. signal from electrified buss bars. By using diodes, a half-wave positive signal selects one output and a half-wave negative signal selects the other output.



These inputs receive a 120 V.A.C. digital signal. This signal can be generated in one of two ways. The first is with the use of a programmable controller and 120 V.A.C. output cards combined with diodes. The second method of generating the half-wave signal is through the existing 230 V.A.C. / 3 phase power supplied from the power rails. This may be done by either our ZONE BOX or by connecting diodes ( 1N4006 ) from one of the phases to the command rail.

+, - These inputs allow the use of a 12 V.D.C. or 15 to 24 V.D.C. power supply to operate the on board logic. When 12 V.D.C. is being used , jumper J1 is shorted and; when 15 to 24 V.D.C. is used, jumper J1 is open. (D5 must be removed from the board on boards prior to revision B for 15 to 24 volt operation.) Each board requires 9 ma..  


Pos, Neg

The outputs are open collector and are rated at 24 V.D.C. at 50 ma. The P output is energized when a positive half-wave is applied to the input and the N output is energized when a negative half-wave is applied to the input.  Revision B and earlier versions of the board have a four position terminal block, and revision C has a six position terminal block.  Revision B and earlier boards have the output transistors internally tied to the negative power terminal and can only sink current.  Revision C and later bring each of the output transistors to collectors and emitters to their own terminals and can source or sink current depending on how they are wired.  

The revision C board is backward compatible with earlier boards in that the existing four pin terminal block may be installed on the leftmost four header pins of the six pin socket and the emitters of each output connected to the negative supply on the board by installing a conventional (.1 spacing jumper) on J2 and J3.


Rail (Half Wave 120 Volt Input)
Com (Power Neutral)

TB 2 Rev A or B

Common (Logic power) -
Board Power +
Pos (+) collector
Neg (-) collector

TB 2 Rev C

Common (Logic power) -
Board Power +
Pos (+) collector
Neg (-) collector
Pos (+) emitter (J2 ties to common)
Neg (-) emitter (J3 ties to common)


Power dissipation in the half-wave input under worse case conditions is 2.5 watts.  Power dissipation in the logic is 0.22 watts worse case, and 0.08 watts for both outputs with them sinking 50 ma.. The total worse case power dissipation is 2.8 watts.  Beware of excessive heat build up in NEMA enclosures.


This board is designed to fit in a 4 inch Augat/RDI snap track, or in Phoenix (107.5 mm) or Entrelec (100 mm special order) DIN rail mounted board housings. It is 50.8 mm (2 inches) wide and rated for 50 degrees C.

REV 2-7-92, 11-3-93, 12-1-93, 5-28-94

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Page last revised 7-24-2001

Riley Home Page


Ronald J. Riley
1323 West Cook Road
Grand Blanc, MI 48439
Phone (810) 655-8830 - Fax (810) 655-8832

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