Pilz PNOZ mm0p 24VDC - Manual (Page 80)

RS232/Ethernet interfaces
Operating Manual PNOZmulti communication interfaces
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Header
Byte 0 ... Byte 7 form the data block's header
} Byte 0: Always 0x05
} Byte 1: Always 0x15
} Byte 2: Always 0x00
} Byte 3: Payload amount plus 5
} Byte 4
– Request: Request number
A request is defined via the request number
Requests
– Response: Confirmation of request
The request is confirmed: Request number + 0x80 (Bit 7 set).
If the request cannot be processed, an error message is returned
Troubleshoot-
ing [ 91] .
} Byte 5: High Byte of segment number
} Byte 6: Low Byte of segment number
} Byte 7
– Request: Always 0x00
– Response: Reserved
Usable data
Byte 8 ... Byte "Amount of usable data + 7" contain the requested usable data. The content
and amount of usable data depend on the request. 0 - 40 Bytes of usable data can be
transmitted. If no usable data is available, the BCC (Block Control Check) will follow directly
after Byte 7.
} Bytes 8 ... "Amount of usable data + 7" (request):
Application data, which is sent to the PNOZmulti
} Bytes 8 ... "Amount of usable data + 7" (response):
Application data, which is sent from the PNOZmulti
Information data
The Bytes "Amount of usable data + 8 and + 9" contain the information data
} Byte "Amount of usable data + 8": Check sum (Block Control Check = BCC)
The check sum is calculated as follows:
BCC = 0 – (Byte 4 + ... Byte "Amount of usable data + 7")
} Byte "Amount of usable data + 9": Last Byte in each telegram
5.5.1
5.5.2
5.5.3