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8300 8315 L&J Tankway Software Description
4.18.2 Application
The LJ1500 point provides an interface to L&J MCG1500 Servo Gauges. L&J Model 1500
Servo 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 MCG 1500.
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 LJ1500 point on the Model 8315 and verifies it is scanning
for gauges. If the Model 8315 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.
Configuration
Parameters
Function