Slave processor for controlling environments

• US 4,740,882 A
• Filed: 06/27/1986
• Issued: 04/26/1988
• Est. Priority Date: 06/27/1986
• Status: Expired due to Fees

• Current Assignee: Environmental Computer Systems Incorporated
• Original Assignee: Environmental Computer Systems Incorporated
• Inventors: Miller, Peter T.
• Primary Examiner(s): Ruggiero, Joseph
• Application Number:
  US06/879,352
• Time in Patent Office: 669 Days
• Field of Search: 364/131-134, 364/140-147, 364/138, 364/139, 364/200 MS File, 364/900 MS File, 340/825.05, 340/825.06, 340/825.07, 340/825.08, 340/825.11, 340/825.13, 340/825.54, 340/825.55
• US Class Current: 700/3
• CPC Class Codes: G05B 19/042 using digital processors G05B19/05 takes precedence
• CPC Class Codes: G05B 2219/2231 Master slave
• CPC Class Codes: G05B 2219/23051 Remote control, enter program remote, detachable programmer
• CPC Class Codes: G05B 2219/23252 High level language HLL, basic, control language
• CPC Class Codes: G05B 2219/24125 Watchdog, check at timed intervals
• CPC Class Codes: G05B 2219/24138 Battery backup
• CPC Class Codes: G05B 2219/24198 Restart, reinitialize, boot system after fault detection, hanging up, stalling
• CPC Class Codes: G05B 2219/25178 Serial communication, data, also repeater
• CPC Class Codes: G05B 2219/25188 Superposition high frequency data signal on power lines, current carrier
• CPC Class Codes: G05B 2219/25189 Current mode sensor I-O, current loop, 40-mA loop instead of voltage
• CPC Class Codes: G05B 2219/25337 Sbc single board computer, stand alone
• CPC Class Codes: G05B 2219/25384 Analog I-O to microprocessor to set switch moment for next step
• CPC Class Codes: G05B 2219/25425 Personal computer

Abstract

A slave processor for controlling environments has a microprocessor coupled to digital inputs and outputs, to an analog-to-digital convertor connected to analog outputs, to an interface connected, and to a decoder, to a carrier current transmitter, and to a switch. The interface is connected to the serial input of the microprocessor and the switch is connected to the serial output of the microprocessor. The microprocessor is capable of retrieving at least one bit of data information from the digital inputs, retrieving a byte of data information from the analog-to-digital convertor, sending a bit of control information to the digital outputs and sending a pulse-width-modulated control signal to the carrier current transmitter in accordance with operating system instructions and applications program instructions in a first mode, and the microprocessor is capable of outputting stored applications program instructions, logged data and status information in serial form to the interface and receiving new applications program instructions in serial form from the interface in accordance with operating system instructions in a second mode.

Claims

1. A slave processor for controlling environments, comprising:

(a) a microprocessor having a first plurality of terminals connected to lines of a data bus, a second plurality of terminals connected to lines of an address bus, a third plurality of terminals connected to a corresponding plurality of selector signal lines, a serial output terminal, and a serial input terminal;

(b) a plurality of digital outputs connected to said data bus by way of digital output means;

(c) a plurality of digital inputs connected to said data bus by way of digital input means;

(d) a plurality of analog inputs connected to said data bus by way of analog-to-digital conversion means having multiplexing means incorporated therein;

(e) decoding means having a plurality of input terminals respectively connected to said plurality of selector signal lines and output terminals connected to said digital input means, said digital output means and said analog input means for sending enabling signals thereto;

(f) interfacing means for connecting said serial input terminal of said microprocessor to an external control arrangement;

(g) memory means connected to said data bus and said address bus for storing operating system instructions, applications program instructions, logged data and status information;

(h) a carrier current transmission means for transmitting signals output from said serial output terminal by said microprocessor; and

(i) switching means having an input terminal connected to said serial output terminal of said microprocessor and having a first output terminal connected to said interfacing means and a second output terminal operatively coupled to said carrier current transmission means;

wherein said microprocessor is capable of retrieving at least one bit of data information from said digital input means, retrieving a byte of data information from said analog-to-digital conversion means, sending a bit of control information to said digital output means and sending a pulse-width-modulated control signal to said carrier current transmitter in accordance with operating system instructions and applications program instructions in a first mode, and said microprocessor is capable of outputting said stored applications program instructions, logged data and status information in serial form to said interfacing means and receiving new applications program instructions in serial form from said interfacing means in accordance with operating system instructions in a second mode.

2. The slave processor as defined in claim 1, wherein said microprocessor has a clocking terminal connected to driving means inside said microprocessor and a reset terminal, further comprising a timing means connected to said clocking terminal and outputting a clocking signal of a first predetermined frequency, and counter means for dividing said clocking signal of said first predetermined frequency into a reset signal of a second predetermined frequency, said counter means having an input terminal connected to the output terminal of said timing means, a first output terminal operatively connected to said microprocessor reset terminal, and a reset terminal connected to a further output terminal of said decoding means, wherein said decoding means is capable of outputting a reset signal to said counter means in response to a predetermined combination of selector signals output by said microprocessor on said selector signal lines, said predetermined combination of selector signals in turn being output at a third predetermined frequency in accordance with operating system instructions in said first mode, and wherein said counter means is capable of outputting said reset signal of said second predetermined frequency to said reset terminal of said microprocessor, said second predetermined frequency being less than said third predetermined frequency, whereby said microprocessor is automatically reset only if the count in said counter means reaches a predetermined level as a result of the discontinuance of the regular output of said predetermined combination of selector signals at said third predetermined frequency.

3. The slave processor as defined in claim 1, further comprising power supply means and a plurality of ports, each of said ports having four contacts, including:

(a) a first group of ports each having one contact connected to a digital output, one contact connected to an analog input, one contact connected to said power supply means, and one contact connected to ground;

(b) a second group of ports each having three contacts connected to digital inputs and one contact connected to ground;

(c) a third group of ports each having two contacts connected to analog inputs, one contact connected to said power supply means, and one contact connected to ground; and

(d) a fourth group of ports each having two contacts connected to digital outputs, one contact connected to said power supply means, and one contact connected to ground.

4. The slave processor as defined in claim 3, wherein a further port has two contacts connected to digital inputs, a contact connected to said power supply means, and a contact connected to ground.

5. The sieve processor as defined in claim 3, wherein a further port has three contacts connected to analog inputs and one contact connected to ground.

6. The slave processor as defined in claim 1, wherein said memory means comprises EPROM or ROM means for storing the operating system program and RAM means for storing logged data and status information.

7. The slave processor as defined in claim 6, wherein said memory means further comprises ROM or EPROM/RAM means having a write enable terminal connected to said microprocessor by way of a user-settable jumper, said jumper having a first position whereat said EPROM/RAM means functions as an EPROM or ROM and a second position whereat said ROM or EPROM/RAM means functions as a RAM.

8. The sieve processor as defined in claim 1, wherein said external control arrangement is a higher-level computer.

9. The slave processor as defined in claim 3, wherein each of said ports is connected to a peripheral device by way of a telephone type cable.

10. The slave processor as defined in claim 1, wherein said memory means comprises a plurality of memory chips, each memory chip having a plurality of address terminals and a chip select terminal, said address terminals of said microprocessor being connected to a corresponding number of said address terminals of each memory chip, said slave processor further comprising latchin means having input terminals connected to some of said address terminals of said microprocessor and having output terminals connected to said chip select terminals by way of gating means.

11. The slave processor as defined in claim 10, wherein said latching means has further output terminals connected to those address terminals of said memory chips which are not connected to the address terminals of said microprocessor.

12. The slave processor as defined in claim 2, further comprising a latching means having an input terminal, an output terminal, and a reset terminal, said microprocessor having an interrupt terminal connected to said output terminal of said latching means and a register for storing a count corresponding to the number of interrupt signals received at said interrupt terminal after a predetermined time, said counter means having a second output terminal connected to said input terminal of said latching means, said second output terminal outputting an interrupt signal of a fourth predetermined frequency, in response to which said microprocessor updates the count in said register.

13. The slave processor as defined in claim 12, further comprising gating means having input terminals connected to first and second status terminals of said microprocessor and having an output terminal connected to said reset terminal of said latching means, said microprocessor enabling said gating means in response to an interrupt signal, whereby said latching means is reset.

14. The slave processor as defined in claim 1, wherein said digital input means comprises first and second latching circuits each having an output enabling terminal connected to an output terminal of said decoding means.

15. The slave processor as defined in claim 1, wherein said digital output means comprises first and second latching circuits each having a clock terminal operatively connected to a respective output terminal of said decoding means by way of respective gating means, and first, second and third driving circuits each having a plurality of input terminals connected to corresponding output terminals of said first and second latching circuits.

16. The slave processor as defined in claim 1, further comprising analog signal conditioning means and a plurality of current mode sensors connected to said analog-to-digital conversion means, said analog signal conditioning means being connected to input a voltage to said conversion means corresponding to the current input by a selected current mode sensor minus a base current supplied to said selected sensor, said input voltage being converted from an analog to a digital signal by said conversion means.

17. The slave processor as defined in claim 1, wherein said memory means comprises first and second memory chips in which first and second applications programs are stored, each of said first and second memory chips having a chip select terminal operatively connected to the address terminals of said microprocessor by way of a jumper block, said jumper block comprising jumpers which are settable to first and second positions, said first memory chip being selected in response to predetermined chip select signals from said microprocessor when said jumpers are in said first positions and said second memory chip being selected in response to said predetermined chip select signals from said microprocessor when said jumpers are in said second positions, said microprocessor outputting said predetermined chip select signals when an applications program instruction is to be performed.

18. The slave processor as defined in claim 1, wherein said interfacing means comprise first through fourth current mode operational amplifiers and an RS232 connector having a plurality of contacts, said first operational amplifier having an output terminal operatively connected to said microprocessor and an input terminal operatively connected to a first contact of said RS232 connector for receiving a request-to-send signal from said external control arrangement, said second operational amplifier having an input terminal operatively connected to said microprocessor and an output terminal connected to a second contact of said RS232 connector for outputting a clear-to-send signal to said external control arrangement, said third operational amplifier having an input terminal operatively connected to said serial output terminal of said microprocessor by way of said switching means and an output terminal connected to a third contact of said RS232 connector for transmitting serial data to said external control arrangement, and said fourth operational amplifier having an output terminal operatively connected to said serial input terminal of said microprocessor and an input terminal operatively connected to a fourth contact of said RS232 connector for receiving serial data from said external control arrangement.

19. The slave processor as defined in claim 18, wherein said serial data received at said serial input terminal by said microprocessor is converted to parallel data inside said microprocessor in accordance with operating system instructions stored in said memory means.

20. The slave processor as defined in claim 19, wherein the serial data transmitted at said serial input terminal by said microprocessor is converted from parallel data inside said microprocessor in accordance with operating system instructions stored in said memory means.

21. The slave processor as defined in claim 1, wherein said analog-to-digital conversion means has a plurality of selection input terminal connected to said microprocessor by way of said first data bus and a plurality of analog input terminals respectively connected to said plurality of analog inputs, a selected one of said plurality of analog input terminals being enabled in response to a predetermined combination of selection signals received at said selection input terminals.

22. The slave processor as defined in claim 1, further comprising a remotely located analog setting module connected to one of said ports and an alarm circuit connected to another of said ports, said analog setting module having a user-accessible dial for setting an analog signal, said microprocessor being capable of disarming said alarm circuit only in response to the setting of said dial to produce an analog signal corresponding to a prestored predetermined analog value.