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ET200S CPU and encoder

Created by: PSantiago at: 3/16/2011 10:52 AM (3 Replies)

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3/16/2011 10:52 AM	Rate (0)
PSantiago Member Joined: 1/9/2008 Last visit: 5/4/2021 Posts: 3 Rating: (0)	Hi, I want to upgrade the actual machine PLC, S7-200, to an IM151-8 PN/DP CPU. I'm using the IM CPU for space reasons. I've 2 encoders (2 channel each). In the S7-200 it was very easy to use the integrated encoder function. With the new IM CPU I'm thinking on using a 2DI HF. The channel A will be used to trigger a hardware interrupt (OB40). In the OB40 I test the value of the channel B, and this way "simulate" an encoder. Will this configuration work? Best Regards Pedro Santiago

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3/16/2011 11:39 AM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 6/5/2023 Posts: 8587 Rating: (1127)	Dear PSantiago, It all depends on how fast the pulses are coming from encoder. There is a possibility of losing pulses. Perhaps you can better use Count modules. Best regards, Wizard

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3/16/2011 11:56 AM	Rate (0)
PSantiago Member Joined: 1/9/2008 Last visit: 5/4/2021 Posts: 3 Rating: (0)	Hi, What counter module would you advise me. Thanks, Pedro Santiago

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3/16/2011 12:17 PM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 6/5/2023 Posts: 8587 Rating: (1127)	Hi, There are two options: 6ES7 138-4DA04-0AB01 Count 24 V/100 kHz or 6ES7 138-4DE02-0AB01 Count 5 V/500 kHz Best regards, Wizard

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