Traffic control malfunction management unit with per channel red enable
First Claim
1. A malfunction management unit for a traffic control system for monitoring traffic control signals for a Red Fail fault in which no signal is active in a given channel, the malfunction management unit having input terminals for receiving control signals grouped in channels and used to operate the traffic control lights;
- monitoring means for detecting a Red Fail fault from the signals in the channels; and
channel selection means for enabling a Red Fail test on a channel specific basis.
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0 Petitions
Accused Products
Abstract
A m thod and apparatus for monitoring for Red Fail faults in a traffic signal control system. Traffic control signals generated by a traffic control unit are grouped into channels. Certain channels are specified for Red Fail testing in which all lights in a given channel are inactive at the same time. Channels which are not specified are not subject to Red Fail testing, but other conflict testing can still be performed on these unselected channels.
11 Citations
8 Claims
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1. A malfunction management unit for a traffic control system for monitoring traffic control signals for a Red Fail fault in which no signal is active in a given channel, the malfunction management unit having input terminals for receiving control signals grouped in channels and used to operate the traffic control lights;
- monitoring means for detecting a Red Fail fault from the signals in the channels; and
channel selection means for enabling a Red Fail test on a channel specific basis. - View Dependent Claims (2, 3, 4)
- monitoring means for detecting a Red Fail fault from the signals in the channels; and
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5. A method of monitoring for Red Fail faults in a traffic control system for coordinated operation of a plurality of traffic control lights;
- the method comprising the steps of;
(a) providing a plurality of input terminals for receiving control signals grouped in channels and used to operate the traffic control lights;
(b) specifying those channels for which a Red Fail test is to be performed;
and (c) monitoring the control signals in the specified channels for a Red Fail fault. - View Dependent Claims (6, 7, 8)
- the method comprising the steps of;
Specification