Chapter 4
Fieldbus Specific Area
This area contains data that is used for fieldbus specific features.
StatErr Indication (640h, R/W)
The StatErr Indication bit is used when the application needs to indicate a serious fault to the master.
For the master to recognize a fault, the STERR bit must be set for at least 300ms. The master can ac-
knowledge the fault by increasing the ModAck Counter register in the Fieldbus specific output area.
Note that the module itself can also use the StatErr Indication to tell the bus master that the application
has stopped operating though this will not be visible via the STERR bit in this register. This occurs if
the difference between the outbound and inbound watchdog counter registers in the DPRAM exceeds
the value specified in the Anybus_INIT mailbox message. Also note that a watchdog counter error is a
non recoverable error, the module must be reset in order to clear it.
ModAck Counter (650h, RO)
If a serious fault has been reported by the application via the StatErr Indication register in the Fieldbus
specific output area, the master can acknowledge the fault by increasing this register. If the reported er-
ror no longer exists, the StatErr signal should be removed.
Actual Baud Rate (652h, RO)
After initialisation, this register indicates what baud rate that is configured for the module. The module
is locked to this baud rate and can not be used with masters that uses other baud rates.
Values:
00h - 500kbit/s
01h - 2Mbit/s
Control area
For further information about the Control Area contents, please see the Anybus-S Design Guide.
Fieldbus Type
Values:
0011h - Interbus 2Mbit/s
Address (Hex)
Contents
Access
640h
StatErr Indication
Read / Write
641h - 64Fh
(reserved)
-
650h
ModAck Counter
Read Only
651h
Physical Interface Type
Read Only
652h
Actual Baud rate
Read Only
653h - 65Fh
(reserved)
-
b7
b6
b5
b4
b3
b2
b1
b0
-
-
-
-
-
-
-
STERR
