actual oil temperature: parameter 4 (An. actual compressor pressure: parameter 0 (An. Some interesting parameter numbers, which I used in my application: 4.3, page 9.For proper understanding of communication mechanismtry to "dig" through example(s) in chptr. Byte 0, Header: header is explained in chpt. According to description, this is a profibus parameter Nr.0 (see pages 21, 22).īytes 5 to 7 are then dependent on values in first 4 bytes you have to study this from parameter to parameter.ĥ. Structure of data record:īyte 1: Node address (Than is a CAN addres of connected compressor on "CAN" side of gateway!)īytes 2 and 3: so called "profibus parameter" this is the number of parameter (of the compressor!), which is to be read or written to detailed explanation of parameter numbers and their meaning is in manual!įor example: in my case, actual compressor pressure could be seen on Analogue input 1. Understanding of communication principle: each question or answer is allways 8 bytes long (= 1 data record). 6, page 54)! Anyhow, in HW configuration, you have to programm the same "buffer", as it was earlier programmed on ComBox.Ĥ. HW configuration: where did you get a GSD file? I could not find it on the net, therefore I had tocreate it bymyself, according to example in manual (chpt. PB address of ComBox can be set on Bottom address switches on the device (see photo on page 5, chpt. 4.2, page 8 of manual) must be programmed in. In our country, it can be done only through authorised personal (from Atlas Copco). "Profibus side" of Combox must be properly programmed.
Profibus master communicates with this ComBox Compressor (one or more of them!) then communicate with a ComBox through local CAN bus.Ģ. Electronicon ComBox is a Gateway between Profibus and CANBUS. I can explain procedure shortly, only for Step7.ġ. I have recentlyestablished Profibus DP connection between S7 and ATLAS Copco, in Step7, not in PCS7.
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