Communication
C3F_T40
390 192-121102 N04 June 2008
6.8 HEDA Bus
In this chapter you can read about:
HEDA standard mode.......................................................................................................391
HEDA expansion (HEDA advanced) ................................................................................393
Coupling objects...............................................................................................................412
HEDA:
High Efficiency Data Access: Option M10 or M11
Real-time data transfer
High-stage axis synchronization
fixed transfer rate of 10MBit/s
Jitter < 300ns (Bus) which results in a high synchronicity
Peer-to-Peer communication
maximum cable length 50m (greater lengths on request)
1 Master / 31 Slave: Individual HEDA axis address inthe range between 1...32
fixed cycle time of 0.5ms
Synchronization of the scanning grid of the digital control loops
and of the setpoint generation
cyclic data exchange
acyclic data exchange of time-uncritical values
HEDA wiring (see page 448)
Function of the HEDA LEDs
Green LED (left)
HEDA module energized
Red LED (right)
Error in the receive area
Possible causes:
at the Master
no slave sending back
Wrong cabling
Terminal plug is missing
several masters are sending in the same slot
at the slave
several masters in the system
no master active
Terminal plug is missing
no transmission from one or several receive slots (neither by the master nor by
another slave)
The configuration may take place in two different ways:
HEDA standard: Simple Master -> Slave communication
HEDA advanced: Communication Master <-> Slave and Slave <-> Slave.
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