Emerson ROC827 instruction manual Automatic Self Tests, Low Power Modes

ROC827 Instruction Manual

AGA 3 calculations conform to the methods described in American Gas Association Report No. 3, Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids. Based on the second and third editions, the calculation method is 1992 AGA 3.

The AGA 7 calculations conform to methods described in American Gas Association Report No. 7, Measurement of Gas by Turbine Meters, and use the AGA 8 method for determining the compressibility factor.

The AGA 8 method calculates the compressibility factor based on the physical chemistry of the component gasses at specified temperatures and pressures.

The firmware supports liquid calculation methods ISO 5167 and API 12. Factors for API 12 correction must be supplied through a Function Sequence Table (FST) or user program. For more information, refer either to the Function Sequence Table (FST) User Manual (Form A4625) or the ROCLINK 800 Configuration Software User Manual (Form A6121).

1.4.4 Automatic Self Tests

The operating system firmware supports diagnostic tests on the ROC827 hardware, such as RAM integrity, Real-Time Clock operation, input power voltage, board temperature, and watchdog timer.

The ROC827 periodically performs the following self-tests:

ƒVoltage tests (battery low and battery high) ensure the ROC827 has enough power to run while not allowing the battery to be overcharged. The ROC827 operates with 12 Volts dc (nominal) power. The LEDs become active when input power with the proper polarity and startup voltage (9.00 to 11.25 Volts dc) is applied to the BAT+ / BAT– connectors. Refer to Table 1-1.

ƒThe CPU controls the software “watchdog.” This watchdog checks the software for validity every 2.7 seconds. If necessary, the processor automatically resets.

ƒThe ROC827 monitors Multi-Variable Sensor(s), if applicable, for accurate and continuous operation.

ƒA memory validity self-test is performed to ensure the integrity of memory.

1.4.5Low Power Modes

The ROC827 uses low power operation under predetermined conditions and supports two low power modes, Standby and Sleep.

ƒStandby

The ROC827 uses this mode during periods of inactivity. When the operating system cannot find a task to run, the ROC827 enters Standby mode. This mode keeps all peripherals running and is transparent to

Issued Mar-06 General Information 1-13