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Introduction
16
ATM60 / ATM90 / KHK53
Dec 2021
Comprehensive overview of the basic functions:
Technology
•
Detailed
description
Bus access
•
Token Passing procedure between masters and master-slave
procedure for slaves.
•
Mono-master or multi-master systems are possible.
•
Master and slave devices, max. 126 stations on a bus.
Communication
•
Peer-to-peer (user data traffic) or multicast through Global Con-
trol Commands (GCC).
•
Cyclical master-slave user data transmission
Operations conditions
•
Operate: cyclical transmission of input/output data.
•
Clear: inputs are read, outputs remain in a failsafe status.
•
Stop: no transmission of user data.
Synchronisation
•
Global control commands enable the synchronisation of inputs
and outputs.
•
Sync Mode: outputs are synchronised.
•
Freeze Mode: inputs are synchronised.
Functionality
•
Cyclical user data traffic between master(s) and slave(s).
•
Dynamic activation/deactivation of individual slaves, testing the
slave configuration.
•
Diagnostic functions (3 hierarchical levels).
•
Synchronisation of inputs and/or outputs.
•
Address assignment for slaves over the bus.
•
Maximum possible 246 bytes of input/output per slave.
Safety functions
•
Message transmission with Hamming distance HD = 4.
•
Watchdog timer of the DP slave detects errors of the master al-
located.
•
Access protection for the inputs/outputs of the slaves.
•
Monitoring of user data traffic using an adjustable monitoring
timer for the master.
Device types
•
Class 1 DP Master (DPM1): central programmable controllers
such as PLCs or PCs.
•
Class 2 DP Master (DPM2): developmental or diagnostic tools.
•
DP Slave: device with binary or analogue inputs/outputs.
4.3 Physical Profibus Network Link
4.3.1 Network Topology
The cabling and some specific features such as bus termination, are shown.