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01-04-2014, 10:34 AM #1
MYPRO cpIII communication problem
compressors are Mayekewa screw type with Mypro cp3
In a scenario
Compressors will work in Auto-stage
and it is required to monitor compressors in a special SCADA software, just to monitor
Among with various data related to sytem, it is intended to collect the data of compressors to a device(basically a PLC) which communicates with RS485. The connection with pc will be formed over this device.
Problem:
a collegue insists the RS485 protocols are being used by CP3 and this device are "different"!
Also I have encountered a similiar topic which mentions Mypro CP3 and PLC connection is not feasible though imho the answers were a bit not complete(thus i brought this topic).
and the information related to CP3 on internet is very very limited.
Any ideas or information? Or can you at least tell me why i can not take input from CP3 to PLC (recall: both use RS485)
or any different ideas for monitoring?
Thank you for help
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06-09-2014, 04:50 PM #2
Re: MYPRO cpIII communication problem
Hi
No problem to communicate with a CP III have done this already in 2001, latest project when I worked
with communication to 5 CP III at ones function fine. I'm using a SAIA Burgess PCD3.M5340 and using
the RS485 port. The communication with the CP III is thoug based on ASCII character transmttion.
Example:
To read values from a CPIII you need to send the following string:
STX,_,A1,A2,'04RDDT',_,_,ETX
STX start of text ASCII 2
_ space (blank)
A1A2 Adress of CP II 1..31) if it is 1 A1=0 A2=1
04RDDT fixed ASCII characters
ETX End of text ASCII 3
The returning result is a text string consisting of 276 characters which you the have to split up
Best regards
If you would leave your mail adress I could give you the doc..Last edited by persim; 06-09-2014 at 04:58 PM.
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24-11-2014, 03:20 PM #3
Re: MYPRO cpIII communication problem
hi all
i use the PLC s7 300 to communication with mypro cp3 .I read manual CPIII so i use the format:
STX,SPX,A1,A2,0,4,R,D,D,T,_,_,SPC,SPC,SPC,ETX
it is correctly ?