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Problem with MC_halt instruction

Created by: Domi60 at: 11/26/2012 10:17 AM (1 Replies)

11/26/2012 10:17 AM	Rate (0)
Domi60 Posts: 20 Rating: (0)	I made a program with CPU 1214 firmware 3.1. I have a problem with MC_halt instruction in interrupt function.The motor is stopped only the first time that the interrupt is activated, the second and the other time the motor is not stopped. I try to move the function MC_halt outside the interrupt and set the stop activating a bit and it works. This is not a good solution becouse the motor stops is subjected at PLC cycle time. What can I do to solve the problem? Domenico Attached the pdf file of interrupt instructions Attachment Interrupt fotocellula (OB200).pdf (794 Downloads)
Domi60 Posts: 20 Rating: (0)
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11/26/2012 3:11 PM	Rate (0)
0_Einstein Diamond Member Joined: 7/7/2010 Last visit: 11/12/2024 Posts: 15392 Rating: (2443)	Domi60 I made a program with CPU 1214 firmware 3.1. I have a problem with MC_halt instruction in interrupt function.The motor is stopped only the first time that the interrupt is activated, the second and the other time the motor is not stopped. I try to move the function MC_halt outside the interrupt and set the stop activating a bit and it works. This is not a good solution becouse the motor stops is subjected at PLC cycle time. What can I do to solve the problem? Domenico Attached the pdf file of interrupt instructions I am no expert at motion control commands, but my understanding is they need to be active the entire time the device is being controlled. The problem with putting MC commands in an interrupt block is that the interrupt OBs are only active for ONE scan, not nearly enough time to stop a real-world device. You will want set some tag to trigger the MC_HALT in a cyclic OB. Once it is halted, reset that tag.
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