Varec 8315 Series manual Enables the watchdog task on the Motherboard. The watchdog

8315 L&J Tankway Software Description		TankGate Interface
	Configuration Parameters	Function
	Maxtime	Specifies the maximum time (in secs) between automatic Change
		of State data being sent to the Host in response to a Change of
		State Request. Report must be set to either Low or High for the
		Value parameter to be sent in response to a Change of State
		Request. A value of 0 disables this option. Non-zero values
		cause responses to be sent even if the value has not changed
		since the last message. The maximum is 255 seconds. The
		default is 240.
	Watchdog	Enables the watchdog task on the Motherboard. The watchdog
		task monitors the LJ2000 point on the Model 8315 and verifies it
		is scanning for gauges. If the Model 8215 fails, the 0x4000 and
		the 0x0010 bits of the PntStatus will be set to indicate the failure.

Dynamic Parameters	Function
Level	Floating point value representing the tank level (in feet).
Temp	Floating point value representing the tank temperature (in
	Fahrenheit).
PntStatus	Integer HEX value indicating status of point. Values are:
	0x0002: Scan Timeout
	0x0010: Gauge Not Responding
	0x0020: Blown Transmit Fuse
	0x0040: Parity Error
	0x0080: Tankway Error
	0x4000: Failure of the Model 8315. This bit is set if the
	Watchdog task on the Motherboard determines that the Model
	8315 has stopped updating.
GaugeStatus	Byte value indicating status of the gauge.
AlarmTime	Time that alarm first occurred. The point is in alarm when the
	PntStatus is non zero.
Elapse	Time of the last scan.
ScanTime	Time of the last good reading. A reading is considered good if it
	has no parity or time-out error, and has passed the filter criteria.
Raw1	Raw data from gauge. Value reported as hexadecimal value.
Raw2	Raw data from gauge. Value reported as hexadecimal value.
PntCheckSum	CRC-16 Checksum for point's static Configuration Parameters.

4.19.2Application

The LJ2000 point provides an interface to L&J MCG2000 Gauges. L&J Model 2000 Gauges are connected directly to a Model 8315 Tank Gauge Interface Module. The Model 8315 is automatically detected at startup, and an LJSCAN point is automatically created to manage the scanning task. The Module parameter determines which Model 8315 will be used. The ID must match the unit address of the MCG2000.

60 Installation and Operations Manual