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E/STOP through a plc

9/24/2010 12:39 AM	Rate (0)
aiden25 Posts: 13 Rating: (0)	hi guys, just wondering if anyone can help. ive got a test rig that just consists of basically just a motor for testing gearboxes. ive got an s7-222,td200 and a mm420. the program is a straight forward one where the rig is started and it runs at 60rpm for 30 seconds then upto 600rpm for 5 minutes then 1200rpm for 5 minutes, it then stops changes direction and does the same cycles in reverse, but now i have to add some features to it, like manual control with speed pot. and also guards are going round and remote e/stops. the new program and features arent a problem but i was just wondering if there are any regs on e/stopping a motor through a plc. can you do this or do you have to run it through a e/stop monitoring relay.
aiden25 Posts: 13 Rating: (0)
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9/26/2010 9:51 AM	Rate (0)
umencho Diamond Member Joined: 3/21/2006 Last visit: 3/30/2025 Posts: 10239 Rating: (1183)	Hello, Just for test, you could use only "software" emergency stop. In real system to cover safety instructions you need to have there 'hardware" ES. (to add emergency relay). So, emergency button will be connected to the PLC input and when you press it will activate logic which will stop the motor, simultaneously this button (connected to the E/relay) will energize relay which will stop the motor. Best regards, Hristo Mihalev

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9/28/2010 12:16 AM	Rate (0)
aiden25 Posts: 13 Rating: (0)	hi hristo, yeah i understand how to e/stop the motor and what circuits are involved i just wondered what the uk legislation was for it and if it is legal to use the plc to e/stop the motor or if i need an estop relay (like a pilz pnoz) for the controlled emergency stop of a machine cheers
aiden25 Posts: 13 Rating: (0)
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10/7/2010 6:14 PM	Rate (0)
adam_ski Bronze Member Joined: 4/9/2010 Last visit: 7/4/2025 Posts: 236 Rating: (34)	Suggest you consultISO 13850 Safety of machinery - Emergency stop - Principles for design http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=39078

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