BECKHOFF EtherCAT Registers Section II - Manual (Page 57)

Watchdog Status Process Data (0x0440:0x0441)
Slave Controller – Register Description II-45
3.42 Watchdog Status Process Data (0x0440:0x0441)
Table 60: Register Watchdog Status Process Data (0x0440:0x0441)
ESC20 ET1100 ET1200 IP Core
(w ack) (w ack) (w ack)
Bit Description ECAT PDI Reset Value
0 Watchdog Status of Process Data (triggered
by SyncManagers)
0:
Watchdog Process Data expired
1: Watchdog Process Data is active or
disabled
r/- r/
(w ack)* 0
15:1 Reserved r/- r/
(w ack)* 0
* PDI register function acknowledge by Write command is disabled: Reading this register from PDI clears AL
Event Request 0x0220[6]. Writing to this register from PDI is not possible.
PDI register function acknowledge by Write command is enabled: Writing this register from PDI clears AL Event
Request 0x0220[6]. Writing to this register from PDI is possible; write value is ignored (write 0).
3.43 Watchdog Counter Process Data (0x0442)
Table 61: Register Watchdog Counter Process Data (0x0442)
ESC20 ET1100 ET1200 IP Core
Bit Description ECAT PDI Reset Value
7:0 Watchdog Counter Process Data (counting is
stopped when 0xFF is reached). Counts if
Process Data Watchdog expires. r/
w(clr) r/- 0
NOTE: Watchdog Counters 0x0442-0x0443 are cleared if one of the Watchdog Counters 0x0442-0x0443 is
written. Write value is ignored (write 0).
3.44 Watchdog Counter PDI (0x0443)
Table 62: Register Watchdog Counter PDI (0x0443)
ESC20 ET1100 ET1200 IP Core
Bit Description ECAT PDI Reset Value
7:0 Watchdog PDI counter (counting is stopped
when 0xFF is reached). Counts if PDI
Watchdog expires. r/
w(clr) r/- 0
NOTE: Watchdog Counters 0x0442-0x0443 are cleared if one of the Watchdog Counters 0x0442-0x0443 is
written. Write value is ignored (write 0).