16.2.3
Process data transfer
•
Process data is cyclically transferred between the EtherCAT master and the slaves (perma-
nent exchange of current input and output data).
•
The transfer of process data is time-critical.
•
The process data serve to control the EtherCAT slaves.
•
The process data can be directly accessed by the master. The data in the PLC, for instance,
are directly stored in the I/O area.
•
The contents of the process data are defined via I/O Data mapping (definition of the Ether-
CAT objects that are to be transmitted cyclically).
•
Process data is not saved in the device.
•
Process data is, e. g. setpoints, actual values, control and status words.
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Configuration
•
The available objects can be mapped in the CiA 402 operating mode " CiA: Velocity mode
" (
= 2) and as dynamic (free) configuration. The contents can be selected from all
mappable objects.
•
Standard mapping objects for the CiA 402 operating mode " CiA: Velocity mode ":
•
Mapping objects for a dynamic (free) assignment:
•
Mapping is executed in the master configuration and automatically transferred to the
slave.
•
The data format is 0xAAAABBCC (AAAA = index, BB = subindex, CC = length).
16.2.3.1
Standard mapping
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Standard mapping of the RPDOs in the CiA 402 operating mode " CiA: Velocity mode "
Master
à
slave
RPDO mapping entry 1 ( CiA: Velocity mode )
CiA: Controlword (
)
RPDO mapping entry 2 ( CiA: Velocity mode )
CiA 402 parameter " Target velocity " (
)
RPDO mapping Entry 1 (freely configurable)
Not assigned.
Standard mapping of the TPDOs in the CiA 402 operating mode " CiA: Velocity mode "
Slave
à
master
TPDO mapping entry 1 ( CiA: Velocity mode )
CiA: Statusword (
)
TPDO mapping entry 2 ( CiA: Velocity mode )
CiA 402 parameter " Velocity actual value " (
)
TPDO mapping entry 3 ( CiA: Velocity mode )
Error code (
)
TPDO mapping entry 1 (freely configurable)
Digital inputs
16.2.3.2
Dynamic (free) configuration
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The freely configurable mapping objects contain an 8 bit dummy entry (0x00050008). This
ensures that each object is transferred cyclically with 16 bits.
16.2.3.3
Further communication objects
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The parameters for the implemented EtherCAT objects are described below.
16.2.3.4
Expert settings
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•
The sync managers are configured for the cyclic data transfer and the mailbox communica-
tion (display in ... ).
•
For the communication, the I/O data mapping must be configured via ... (for RPDOs) and
... (for TPDOs).
•
The basic settings for the sync managers are made via ... and ... .
Configuring the network
EtherCAT
Process data transfer
341
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