Multi-input module for motorized gate and door operators

Abstract

A system and method which allows automatic recognition of any of three common monitored motorized door or gate safety edges or other entrapment protection devices. The invention allows retrofitting existing motorized door operators without enough monitored input ports to allow for more monitored entrapment devices required on laterally moving motorized gates. The system interfaces with obstruction monitoring devices in normally closed, pulsed, or resistive termination operating environments found in entrapment protection systems. Firmware logically analyzes the state of each edge or entrapment protection device to select and direct an appropriate output signal for a motorized gate operator. An operational example is disclosed which provides for up to six different device inputs and two separate outputs for the motorized door operator, which can be configured through dual inline package switches allowing field configuration.

Claims

1. An interface between multiple monitored obstruction sensing devices of two or more signaling characteristics, said two or more signaling characteristics being resistive termination, normally closed or pulse type obstruction sensing and a motorized gate operator with fewer sensing device inputs than required for a given application, the interface comprised of: at least two input ports configured to connect to at least two monitored obstruction sensing devices, each input port configured for automatic recognition of any of either said resistive termination, normally closed, or pulsed obstruction sensing devices; at least one output port configured to connect with at least one input on said motorized gate operator in which each said at least one input is adapted to either a resistive termination, normally closed or pulsed sensor signaling characteristic; whereby the interface is programmed to recognize the signaling characteristics of each said sensing device and route each said sensing device according to the at least one output port which is configured for said signaling characteristic of said motorized gate operator.

2. The apparatus of claim 1 further including means to select the signaling characteristics association between each said input port and one of two or more said output ports configured to connect with at least one said input on said motorized gate operator.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a block diagram illustrating available input configuration of a typical device used for one of the inputs of the invention.

(2) FIG. 2 is a block diagram illustrating a typical configuration for use of the invention with different entrapment protection device formats and the six device input ports which can be associated with two separate outputs ports.

(3) FIG. 3 is a block diagram of an auxiliary relay used to control power to a typical normally closed monitoring device used with the present invention.

DETAILED DESCRIPTION OF THE INVENTION

(4) The general description of the Multi-Input Module (“MIM”) provided below may be considered with reference to the Figures in which like numerals relate to like parts. FIG. 1 is a block diagram of one entrapment protection device used with the invention. FIG. 2 is a block diagram of the invention's architecture demonstrating connection of two or more devices to the invention with at least two output ports for connection to a motorized door or gate operator. The example presented has six inputs for entrapment protection devices and two outputs to a motorized gate (or door) operator. Though not widely needed, it can be appreciated that more than two outputs ports can be configured in an embodiment. In general, any combination where there are more devices than operator control inputs can use the invention. An embodiment of the invention made strictly for the motorized door industry might only have two inputs and one output. However, motorized gates now require more devices for suitable entrapment protection.

(5) Most current gate operators do not have enough inputs to accept more than one or two devices in each direction. The current UL 325 requirements may create situations where more devices are required than can be accepted by the operator. The present disclosure will make it possible to connect more devices. The invention also accounts for unused inputs in the event less than all the inputs are actually used in a given installation. In the preferred embodiment shown in FIG. 2, there are six universal input ports for up to six entrapment sensing devices 12, 14, 16, 18, 20 and 22. These will accept normally closed (“NC”), pulsed, and resistor terminated devices. Each input can be associated with either of the two outputs 26 or 28. The outputs can be set for resistor terminated, pulsed or NC mode each of which will have different characteristics for a motorized gate operator. The invention is housed in a metal chassis which is intended to be mounted inside the chassis of a gate operator.

(6) As to requirements for a power supply, this device will be connected to the standard operator voltages (typically 12 VDC to 24 VAC). DC power can be available to the accessory devices. Each input port will have four connections: two for power 42 and 36 and two for signal out from the entrapment sensing device 38 and 44. A 10KΩ pull-up resistor 32 is sufficient for the NC and pulsed logic levels, and provides the range needed to monitor a resistor termination via an analog to digital converter. There is one LED associated with each input to indicate operation.

(7) The outputs 26 and 28 will be either opto-relays or mechanical relays. They can be selected as either NC, resistor terminated or pulsed (independently), via a dual inline package) (“DIP”) switch selected by the user, or other user input selection methods. There is an LED for each output that indicates a fault mode. Each input can be assigned to either output A 26 or B 28. This will be done via a DIP switch in the user selectable input/output association 24. FIG. 2 discloses the relationship of each entrapment device to the MIM inputs 50 through 60 inclusive.

(8) After installation of the preferred embodiment and it is configured properly and there are no faults from any of the devices, the installer can initiate a sequence to execute a program in firmware which will examine each input 12, 14, 16, 18, 20, and 22 to determine which type of device is connected to a given input: NC, pulsed, resistive, or absent. A status LED can be configured to blink to indicate that this is in process. Once complete, the input channel information determined by the firmware routine will be stored in an EEPROM and normal operation will begin. Prior to this configuration procedure, the outputs 26 and 28 will be in a fault mode, and the microprocessor will continuously scan the inputs to assist the installer with the setup.

(9) During a learn mode, any input that is near Vcc/2 will be considered a resistive termination, in the United States typically 10KΩ is used. With configured firmware set up to do so, any input that is HI for 10 ms will be considered not connected. The remaining inputs will be examined for pulsed or NC. During normal operation, any active input that is HI for more than 10 ms will be considered in fault. If a resistive input is LO, it will be considered a fault.

(10) There are two aspects of the innovation in the MIM disclosed as a preferred embodiment. The first is an input design that allows for automatic recognition of any of the three common monitored input interfaces: normally closed, pulsed, and a typical 10KΩ termination. The invention takes advantage of the flexibility found in many microprocessors which allows a single pin to be configured as an analog or digital input. This allows the invention to identify and monitor the three different types of interfaces with a single set of hardware. As described above, the invention can also detect whether a device is not connected or is faulty.

(11) The second aspect of the invention is using computer firmware in a microprocessor to logically detect the type of each device and then to generate an appropriate output signal for the gate operator. The output signal will report a fault condition if any of the inputs are in fault. Restated, in order to report a “good” condition to the operator, every input must also report a “good” condition.

(12) In the preferred embodiment, the invention provides for up to six device inputs and two outputs for the operator. The user can associate the inputs with the outputs via DIP switches. Also, the user can select one of two output formats via different DIP switched. For example: an installation may require five entrapment protection devices, two in the gate close direction and three in the gate open direction. Reference is made to FIG. 2 and the example presented below. The installation table would present as follows:

(13) TABLE-US-00001 Input # Device Type Location Output A/B 1 Normally Closed Photo-eye A (Close) 2 Pulsed (Wireless Leading edge A switch) (Close) 3 Normally Closed Photo-eye B (Open) 4 10K Edge Draw-in post B edge (Open) 5 Pulsed (Wireless Trailing edge B Switch) (Open) 6 Not used

(14) The User would set the DIP switch to associate channels 3, 4, and 5, (16, 18, 20) to Output B 28. After executing a learn firmware routine, the MIM would recognize that Input 6 (22) is not used.

(15) Every input has a 10K pull-up resistor 32 and is connected to an analog-to-digital converter (“ADC”) within microprocessor 25. Firmware which operates microprocessor 25 checks each input to determine if the observed voltage is HI, LO, or in the Middle. If the device connected to the input has a 10KΩ resistance to ground, it will read in the Middle. The MIM firmware is configured to have two modes: learn and run. The first time the invention is powered-up, it defaults to learn mode. In learn mode, each input is checked for HI, LO, or Middle. If the input reads Middle, it is assigned as a 10KΩ device. If the input is LO, it is assigned as a Normally Closed device. If the input is HI, it is assigned as No Connect. These inputs are checked several times, and if an input toggles between HI and LO, it is re-assigned as a pulsed device. When all of the external devices are connected and configured to be in a good (functioning) state, the user will press a learn button (or a software command, or other user input method). These settings will be saved into non-volatile memory, (“saved mode”), and then the MIM will go into the beginning of run mode.

(16) In run mode, the MIM repeatedly checks each input against the set up parameters entered in the saved mode. On power-up, certain extra steps are required for the normally closed interface. To confirm the presence of this type of device, an auxiliary relay 40 is used to control the power to the devices. This type of relay 40 to power input devices is shown in FIG. 3. Relay control is part of the operating firmware and processor 25 can activate relay 40 though relay control pin 46 as shown.

(17) First, this power is kept off (relay open) and each normally closed device input is checked to make sure it reads HI, indicating that the external device is in fault mode (open). If any of these inputs read LO (short), an error is flagged, as the external device is considered faulty. The MIM is configured to stop at this point, and no further actions will occur.

(18) If all of the normally closed inputs read HI, then the auxiliary relay 40 is closed, providing power to devices 12, 14, 16, 18, 20 and 22. Normal operation continues at this point, where any LO signal is considered good, and any middle or high signal is considered Fault. The pulsed and 10KΩ termination inputs do not do anything special on power-up. For 10KΩ devices, any input that is HI (disconnected) or LO (active) is considered a fault.

(19) For pulsed devices, the input state must change from HI to LO, or LO to HI within a defined period (usually 10 ms). If the state does not change in this period, it is considered a fault. Note that in all cases, a missing external device will cause a continuous HI input, which will be reported as a fault. Inputs marked as not used are ignored. In the preferred embodiment, a method is provided to allow for reconfiguration through user inputs by selecting the learn mode. It can be appreciated that this procedure can be made to be complicated enough that a user cannot easily disable the input to a device inadvertently.

(20) Although the invention has been described in accordance with the preferred embodiment, it will be appreciated by those skilled in the art that the application of the present invention is useful in a variety of configurations and designs not specifically described above. All such designs and applications are considered to be within the scope of the present disclosure, and the invention is applicable across a wide variety of applications. Such applications are considered within the scope and spirit of the present invention. In so far as the description above and the accompanying drawings disclose any additional subject matter that is not within the scope of the claims, the inventions are not dedicated to the public and the right to file one or more applications to claim each such additional inventions is reserved.