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Digital Output (Relay / Non-Relay)

Created by: Tuff Gong at: 1/6/2011 10:51 AM (4 Replies)

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1/6/2011 10:51 AM	Rate (0)
Tuff Gong Posts: 41 Rating: (1)	What is the difference between a relay output and a non-relay output? I am migrating an S5 PLC to an S7 PLC and have these cards 16OUT x 24V Relay, and 32OUT x 24V, 0.5A
Tuff Gong Posts: 41 Rating: (1)
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1/6/2011 2:41 PM	Rate (2)
dchartier Grandmaster Joined: 9/27/2006 Last visit: 11/4/2024 Posts: 12293 Rating: (2690)	Hello Tuff Gong; Here is a (very) basic distinction between relay outputs of a PLC compared to transistor/triac outputs: http://www.plcmanual.com/plc-output-units Besides the mentionned differences, relay outputs can generally carry more output current (both DC and AC) than their transistor/triac counterparts, but have a more limited lifespan due to mechanical considerations and are generally slower in response time. Hope this helps, Daniel Chartier

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6/6/2011 12:43 PM	Rate (0)
viralpatel Silver Member Joined: 11/18/2010 Last visit: 8/5/2022 Posts: 523 Rating: (32)	non relay means transistor Sink/Source o/p.this type of o/phas limited current handling capacity and normally usedas high speed o/p (pulse train ) to run servo or stepperand also in low rating relay energizing. relay o/p is used in application where we have to pickup contactor or want to switch high woltage 230v ac etc.. this type of o/p is not usedashigh speed o/p. Viral patel

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6/6/2011 1:38 PM	Rate (0)
Pranab Posts: 63 Rating: (1)	Tuff Gong What is the difference between a relay output and a non-relay output? I am migrating an S5 PLC to an S7 PLC and have these cards 16OUT x 24V Relay, and 32OUT x 24V, 0.5A Dear, In relay DO, output is taken from COM, NO and NC contact. And relay coil is driven by internal circuitry. So isolation is high and output load capability is high. In non-relay DO, there are opto-coupler or other swichting semiconductro device. Regards Pranab
Pranab Posts: 63 Rating: (1)
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6/6/2011 1:45 PM	Rate (0)
Tuff Gong Posts: 41 Rating: (1)	Thanks. That answers my question
Tuff Gong Posts: 41 Rating: (1)
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