Watchdog NTC to F500 PGW CAI REV0 July 2014
Input register data map (Cyclic I/O data transfer – Max 244 bytes see page, see
Appendix A for more information).
The Watchdog data is automatically read for up to 7 controllers. The data returned is
processed and stored in the following format. The position of the data is fixed within the
input data table.
The Watchdog data is automatically read for up to 7
controllers. The data returned is processed and
stored in the following format. The position of the
data is fixed within the input data table.
Word 0 (Byte 1) is used to indicate the number of
Watchdogs that are responding to the request for
data. Word 0 (Byte 0) is unused. This only occurs
once in the entire table. The remaining data stored
in the input bytes is constructed as follows.
All the values are stored in Hexadecimal and Word aligned in this example
Number of Watchdogs detected this time (Byte 1,0) Once only
Watchdog current speed (Byte 3,2)
Watchdog current operating status (Byte 5,4)
Under speed alarm and stop in % (Byte 7,6)
Over speed alarm and stop in % (Byte 9,8)
Current calibration value in PPM (Byte 11,10)
Display scaling factor (Byte 13,12)
NTC Temperature 1 and 2 (Byte 15, 14)
NTC Temperature 3 and 4 (Byte 17, 16)
NTC Temperature 5 and 6 (Byte 19, 18)
NTC temperature sensor status 1 and 2 (Byte 21,20)
NTC temperature sensor status 3 and 4 (Byte 23,22)
NTC temperature sensor status 5 and 6 (Byte 25,24)
Sensor 1 and sensor 2 alarm level (Byte 27,26)
Sensor 3 and sensor 4 alarm level (Byte 29,28)
Sensor 5 and sensor 6 alarm level (Byte 31,30)
Number of sensors in use (Byte 33), Relay status (Byte 32)
Persistent alarm value (Byte 35), update counter (Byte 34
The data from each Watchdog is stored in 17 consecutive words (or 34 bytes) of data.
The first two bytes of the group (e.g. word 1) represent the Watchdog speed.
The second two bytes of the group of the group (e.g. word 2) represent the Watchdog
status.
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