TMC8462 Datasheet • Document Revision V1.4 • 2018-May -09
143 / 204
7.3.11 Application Layer Control
7.3.11.1 Register 66 – AL_OVERRIDE
Bit
Description
ECAT
PDI
Range [Unit]
0
0 = no override
1 = override AL state
-/w
-/w
7:1
unused/reserved
-/-
-/-
Table 188: MFC IO Register 66 – AL_OVERRIDE
Note
The bit controls override configuration of the 24 MFC IO output ports regarding
the output port availability with respect to the actual EtherCAT Slave Controller’s
AL state.
Typically, in an EtherCAT slave the output ports are only available/active when AL
state = "‘OP"’ (operational). If the override bit is set, the AL state is ignored and
the MFC IO ports are fully available via the MFC IO Control Interface.
The ABN functional block, IRQ configuration, Watchdog block are not affected by
this configuration option since they only have input ports/signals.
! This register can only be accessed from MFC IO Control Interface. It cannot be
accessed from ECAT master side.
The input ports are always readable via the MFC IO Control Interface.
When an input port is configured to be accessed by the EtherCAT master, it can
only be read when the EtherCAT state machine is in safe-operational state or
operational state.
When an output port/value is configured to be controlled by the EtherCAT master,
this is only possible when the EtherCAT state machine is in operational state
because. This is defined in the EtherCAT standard.
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