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PWM sur le S7-1200

Created by: AutoGen_1348261 at: 9/5/2023 12:07 PM (3 Replies)

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9/5/2023 12:07 PM	Rate (0)
AutoGen_1348261 Joined: 7/16/2023 Last visit: 9/21/2023 Posts: 1 Rating: (0)	Hello, I am not able to choose a PWM output for my 1212c AC/DC/rly PLC. Is the PWM feature not available for my PLC? Am I doing something wrong? Thank You. Attachment pwm_1.png (86 Downloads)
	Last edited by: AutoGen_1348261 at: 09/05/2023 12:12:07 Last edited by: AutoGen_1348261 at: 09/05/2023 12:16:32
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9/5/2023 1:06 PM	Rate (1)
qwazee Platinum Expert Joined: 3/30/2020 Last visit: 12/1/2023 Posts: 4063 Rating: (875)	AutoGen_1348261 Hello, I am not able to choose a PWM output for my 1212c AC/DC/rly PLC. Is the PWM feature not available for my PLC? Am I doing something wrong? Thank You. A pulsing output (PTO or PWM) is not allowed on a relay. You will need to make a pulse with timers, if you wish to generate a pulse on the relays. Or use the pulse output of a PID. In that case the pulse will be slow. Adding a signal board that has outputs will however give you the ability to run a pulsing output. That is a good idea if you need a high pulse frequency.
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9/5/2023 1:15 PM	Rate (1)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 11/29/2023 Posts: 13945 Rating: (2277)	Relay (RLY) outputs are not compatible with PWM or PTO control since the relays could not keep up with the required speeds for PWM / PTO output toggling, plus, they would likely burn up the relay, or the protective devices for the relay coils. AutoGen_1348261 Hello, I am not able to choose a PWM output for my 1212c AC/DC/rly PLC. Is the PWM feature not available for my PLC? Am I doing something wrong? Thank You.
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9/5/2023 1:21 PM	Rate (1)
JBS98 Regular Member Joined: 7/19/2022 Last visit: 12/1/2023 Posts: 289 Rating: (45)	Hello AutoGen_1348261, The problem is that CPUs with Rly output cannot be used for PWM. You would need a DQ card to be able to have PWM outputs
	If this Information really helps, you could use the Rate function Best Regards, JBS98
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