Internet PLC Forum

General => Technical support => Topic started by: Richard Baum on June 13, 2004, 07:52:53 AM

Title: Interrupt Numbering
Post by: Richard Baum on June 13, 2004, 07:52:53 AM

I am using a T100MD888+  PLC.

I wrote a simple program to test the interrupts 1-8.
Interrupt 1 toggles output 1 on rising edge of input 1
Interrupt 2 toggles output 2 on rising edge of input 2...

INTRDEF 1,1,1       'where custom function 1 is:

TOGGLEIO OUTPUT_1

If I close contact 1, the input 1 led turns on, on-line monitoring shows that input 1 is on, but nothing happens to the output.
But if I close contact 3, the input 3 led turns on, on-line monitoring shows that input 3 is on, but now output 1 toggles.
Input 4 triggers interrupt 2, Input 5 triggers interrupt 3, and input 6 triggers interrupt 4.  Inputs 1, 2, 7, and 8 do nothing.

Is interrupt channel 1 not from input channel 1?

There also seems to be a lot of switch bounce problems.  Sometimes the interrupt triggers twice when I close the switch.  Sometimes it triggers on release of the switch.  Does the PLC have any conditioning for switch bouncing?

Title: Re:Interrupt Numbering
Post by: support on June 14, 2004, 06:18:39 PM

Please check page 1-2 on the T100MD+ User's manual. Only 4 channels of interrupts are supported and these are multiplexed between straight interrupt, Pulse measurements, and high speed counters.