Alarm disabling unit for production equipment

From CaveLab
This page is kept for historical interest. It may document projects or methods that are obsolete and/or no longer relevant. The information here is not kept up-to-date.

I built this module for Sensonor ASA back in 2007, I have no idea if it is alive today.
ADU2 installed on equipment

The purpose of this module is to make it possible to the operator to reset the alarm on the production equipment, but still make sure that the alarm sounds at the next fault. Today there is no way to turn off the alarm until the situation is cleared, but with this module that is now possible. Earlier the operators would remove the relay for the alarm, this gave an unfortunate long stop time if the relay was not placed back and the equipment faulted silently.

Alarm reset

When a alarm situation occurs the red LED flashes and the production alarm sounds, by pressing "reset alarm" the voltage to the sound alarm is cut. The red LED lights continuously when the alarm is reset. When the alarm situation is no more the red LED turns off and the voltage to the sound alarm is restored. When a new fault occurs the procedure is repeated.

I/O

Inputs

  1. PD.0 Reset button
  2. PD.1 Stack lights signal

Outputs

  1. PB.0 Red LED
  2. PB.1 Power LED
  3. PB.2 Stack lights relay N.O

D-Sub 9-pins

Pin Function Color
1 24V Orange
2 0V Orange/white
3 Stack lights in + (to optoisolator) Green
4 Stack lights in - (to optoisolator) Green/white
5 Stack lights relay + Blue
6 Stack lights relay - N.O Blue/white

Drawings

Panel front

Panel-alarm-avstilling-rtc-4lw80q.png

Inside equipment

Alarm-disabling-unit-2-connections-z4nxzg.png

Schematic drawing

Alarm-disabling-unit-2-circuit-8g2m14.png

Internal connectors

Alarm-disabling-unit-2-internal-connections-v4l1zg.png

  1. Signal from internal reset button (With resistor)
  2. 24V supply voltage
    • Red : + (D-sub 1)
    • Blue : - (D-sub 2)
  3. Status LEDs
    • Red : + Red LED
    • Green : + Green LED
  4. Signal from stack lights
    • Red : + (D-sub 3)
    • Blue : - (D-sub 4)
  5. GND to LEDs and switch
  6. 24V to stack lights relay (D-sub 5)
  7. GND to stack lights relay (D-sub 6)

Source code

Git-alt-brands.svg
Bascom-AVR source is available in a git repository:
https://github.com/thomasjsn/AVR-Alarm-disabling-2

Gallery

Parts list

Qty. Part
1 × AVR ATtiny2313-20PU, DIL-20, 20 MHz, 18 I/Os
1 × Capacitor, aluminium electrolytic, 10 µF, 25V
2 × Capacitor, aluminium electrolytic, 47 µF, 25V
1 × Capacitor, ceramic, 1 nF, 100V
2 m Control cable, 8-cores, shield, 0.14mm2, 250 V, Ø 5.1mm
1 × D-sub plastic hood, 9-pin, black
1 × D-sub soldering cups, 9 pin female
1 × D-sub soldering cups, 9 pin male
1 × DIL socket, 20-pin, 7.62mm
1 × DIL socket, 6-pin, 7.62mm
1 × Diode, rectifier, 1 A, 400V, 1N4004
1 × Enclosure, plastic (1591 FL), 120x65x40mm, flange
1 × Fuse 5x20 mm, 400 mA, fast-acting
1 × Fuse holder, open, PCB, 5x20mm
1 × Fuse holder, open, PCB, Protective cover
1 × Heat conducting film for heatsink, Adhesive, TO220
1 × Heatsink, 15K/W @ 4W, 28mm 7g, TO220
1 × LED 5mm clear, Red, 2.1V, 20mA, 7.000mcd, 20°
1 × LED 5mm coloured clear, Green, 2.1V, 20mA, 30mcd, 10°
1 × LED holder 5mm, Black plastic
1 × LED lens 5mm, CLF 280, Red
1 × Optocoupler, single, CNY17F-3, DIL-6
32 cm2 PCB, stripboard, 100x160mm, 160cm2
1 × Resistor, carbon film, 0.25W, 150 Ω, 5%
3 × Resistor, carbon film, 0.25W, 330 Ω, 5%
2 × Resistor, carbon film, 0.25W, 4.7 kΩ, 5%
2 × Resistor, carbon film, 0.25W, 10 kΩ, 5%
1 × Resistor, metal film, 0.6W, 2.2 kΩ, 1%
1 × Spacer, round unthreaded, 3mm, Ø6mm, Delrin
11 × Straight pin header, female, Single row, 2.54mm
11 × Straight pin header, male, Single row, 2.54mm
1 × Switch, push-button, 1-pole, 1A, 50VAC, on-(off)
1 × Transistor, NPN, 100 mA, 45V, 0.5W, BC547B
1 × Voltage regulator +5V, 1 A, 7805PI