Cyclical data in SafetyNET p is communicated as safe PDOs (SPDOs) and has the following format:
- PID ( Packet Identifier):
- Used with the SID for unique data packet identification
- Length: Complete length of packet in Bytes
- Process data: Safe process data
- SID (Safe ID): 16 Bit unique network-wide ID, through which both the sender and the SPDO are uniquely identifiable
- Counter No.: 8 Bit cyclical counter for life sign monitoring on subscribers
- CRC: 32 Bit check sum covering the whole safe data packet
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