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Incremental Encoder

Created by: Dovi_k at: 4/8/2013 9:26 AM (12 Replies)

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4/8/2013 9:26 AM	Rate (0)
Dovi_k Experienced Member Joined: 12/26/2010 Last visit: 4/10/2025 Posts: 27 Rating: (0)	Hi, I have to read data from an incremental encoder where the output signals come in TTL using A+/- ;B+/- ;R+/- signals. I'm using CPU1215C - How to read the data ? I found several ways but I don't know what is correct : 1. Can I use HSC built-in inputs or they are not compatiable with TTL (5V) ? If yes - I have just 2 inputs for A, B but what with the others ? 2. The same as 1. using SB 1221 with 5VDC inputs. What with the other signals ? 3. Using 1Count5V card with ET200S with IM-151-3 (Profinet Remote IO) - It seems to have all the data I need. What is the best way to use - Any other tips will be gladly accepted.
	Last edited by: Doviva at: 4/8/2013 9:29 AM
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4/8/2013 11:56 AM	Rate (0)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 9/3/2025 Posts: 4416 Rating: (1485)	Hi, you can not use ttl signals in a 24Vdc input... The use of SB1221 diwh 5VDC should be a good solution. I suppouse that R+/- are reset signal. Am I right? The use o f 1Count5V signal seems to be also a good solution.
	Last edited by: Pegaia at: 4/8/2013 11:59 AM Denilson Pegaia Siemens Industry Sector Technical Support
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4/8/2013 12:10 PM	Rate (0)
Dovi_k Experienced Member Joined: 12/26/2010 Last visit: 4/10/2025 Posts: 27 Rating: (0)	Hi, If I use the SB where should I connect the 4 signals (A+/A-/B+/B-) when each HSC has just 2 signals for A/B as shown @ the attached ? Attachment hsc.JPG (1474 Downloads)

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4/9/2013 9:17 PM	Rate (0)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 9/3/2025 Posts: 4416 Rating: (1485)	Hi, I suggest you use just A+/B+
	Denilson Pegaia Siemens Industry Sector Technical Support
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4/12/2013 9:42 AM	Rate (0)
Marko Bursic Platinum Member Joined: 9/8/2009 Last visit: 7/17/2023 Posts: 1410 Rating: (154)	1Count5V is a RS422 signal level receiver, not TTL. I doubt also that your encoder is TTL, since it has also the inverted signals

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4/14/2013 7:47 AM	Rate (0)
Dovi_k Experienced Member Joined: 12/26/2010 Last visit: 4/10/2025 Posts: 27 Rating: (0)	Attached are the detailes about the encoder's interpolator that is connected to the PLC. I hope I'll manage to connect it to 1 of the 2 choices above and examine if it works. Attachment heag.jpg (1197 Downloads)

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4/14/2013 6:45 PM	Rate (0)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 9/3/2025 Posts: 4416 Rating: (1485)	Hi, it seems that your encoder could be used as TTL or HTL. If you work with HTL and supply of 24V you can use directly the PLC imputs. TTL and RS485 works both with 5V signal. The diference is that RS485 is differencial, i.e. A ->B, and TTL A->M; B->M. In the praxis, it is same. TIP: not all signals should be used necessarly
	Denilson Pegaia Siemens Industry Sector Technical Support
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4/15/2013 9:47 AM	Rate (0)
Marko Bursic Platinum Member Joined: 9/8/2009 Last visit: 7/17/2023 Posts: 1410 Rating: (154)	I agree with Pegaia, you can use HTL output directly to PLC input 24V, you may calculate max frequency of output since there is a limit. Use A+,B+, (R+) signals only, leave the inverted signals. If you want to use TTL output you will need CB. TTL output shall give approx 5V on high state, while RS422 (485)gives >=2.5V.

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4/15/2013 10:11 AM	Rate (0)
Dovi_k Experienced Member Joined: 12/26/2010 Last visit: 4/10/2025 Posts: 27 Rating: (0)	For a matter of fact - the interpolator I have has 2 TTL outputs instead of HTL/TTL so I can't use the 24V inputs. At the attached manual I got (In german) it says "the output signal is TTL(RS422)" so I'll also try the 1Count5V. "If you want to use TTL output you will need CB." - Did you mean the SB1221 or there is CB that would help also ?

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4/15/2013 9:33 PM	Rate (0)
Marko Bursic Platinum Member Joined: 9/8/2009 Last visit: 7/17/2023 Posts: 1410 Rating: (154)	I meant signal board (SB1221). You can easy check with voltmeter. RS422 level is >=2.5V for high level, this doesn't mean that it can't be also TTL (5V). If you got approx 5V (that probably you will) then use signal board.
	Last edited by: Marko Bursic at: 4/15/2013 9:34 PM
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5/19/2013 1:31 PM	Rate (0)
Dovi_k Experienced Member Joined: 12/26/2010 Last visit: 4/10/2025 Posts: 27 Rating: (0)	Hi again. I finally succeeded to read the encoder's data using the 1count 5V through ET200S. When I configured it as "standard mode" - there was no nread, but when I configured it in "fast mode" - I get the data with status but without latch options.

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5/19/2013 8:21 PM	Rate (0)
Marko Bursic Platinum Member Joined: 9/8/2009 Last visit: 7/17/2023 Posts: 1410 Rating: (154)	I guess, you didn't succede with S7-1200 alone?

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5/20/2013 7:39 AM	Rate (0)
Dovi_k Experienced Member Joined: 12/26/2010 Last visit: 4/10/2025 Posts: 27 Rating: (0)	I couldn't get the SB-1221 for experiments so I don't know if it will work with it directly on the CPU.

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