6 Allocation of Buffer Memories
6.9 [BFM #26] FROM/TO Watchdog
116
FX
3U
-CAN User's Manual
6.9
[BFM #26] FROM/TO Watchdog
The FROM/TO Watchdog can be used when the Module is online to monitor if the PLC program accesses
data BFM #0 to BFM #19, BFM #100 to #399 or BFM #3000 to BFM #3539 cyclically.
After the first FROM/TO on the data BFM, the Watchdog will check if the next access to the data BFM takes
place before the time set in BFM #26 expires.
BFM #26 sets the Watchdog timer in 10 ms steps (default value K20 equals 200 ms).
Note
• If the watchdog expires, bit 7 in BFM #29 is set to ON, and the messages defined in the BFM #1900 to
#1927 "PLC RUN>STOP messages" area or an EMCY Object are transmitted on the network. If the
module is in a CANopen
®
Mode, the module will react according to the value set in the Error behavior
object (Index H1029) in the object dictionary.
→
For PLC RUN>STOP messages, refer to Section 9.6
→
For EMCY Object, refer to Subsection 5.6.13
→
For Error behaviour object, refer to Section 5.7
• If the watchdog function is not required, it can be deactivated by writing K0 to BFM #26.
• The FROM/TO watchdog can be restarted by writing the setting value to BFM #26 again, which will also
reset the error flag in BFM #29.
6.10
[BFM #27] Node Address
This BFM sets CANopen
®
Node-ID. The setting value range is 1 to 127.
Note
• The BFM setting needs to be stored by BFM #22 bit 0 and afterwards be restarted by BFM #25 bit 0 to
make the new setting effective.
• A setting out of the above range or a write access in Layer-2 function mode will generate a Failure
Message in BFM #29 bit 6.
6.11
[BFM #29] Error Status
For further information on error status, refer to the following section.
→
Refer to Section 14.2
6.12
[BFM #30] Module ID Code
The identification code for FX
3U
-CAN is available using a FROM instruction. The identification code for the
FX
3U
-CAN is K7170. By reading this identification code, the user may create built-in checking routines in the
PLC program to check whether the physical position of the FX
3U
-CAN on the special function unit bus
matches the program.
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