GE DS200LDCCH1ALA steam turbine card

Network Scan Time / Rate Group Ratio: This value is set to the ratio of the DeviceNet network scan time and the rate group that the SPC block belongs to. If it is set to too small a value, some of the data communicated over the bus could be lost. It should be set to trunc[(network scan time)/(rate group)] + 1. “Trunc” indicates that the fractional part of the result should be dropped. For example, if the worst-case network scan time is 12 ms and the SPC block rate group is 10 ms, NTWK_RATIO should be set to trunc(12/10) + 1 = trunc(1.2) + 1 = 1+1 = 2. The slow index values will be updated every time this value decrements to zero. It will decrement once every rate group execution. If this number is two small, the slow index values will be updated before they are sent out on the network and data will be over-written and lost. If this number is too big, the slow index data will be sent too slowly. In either case, the slave will report an error in the slow indexed data and set D_RATE_FLT to TRUE.

Output Fields

 CAL_STAT_R: Field calibration sequence request. 0 = No Request/Exit Calibration, 1= Set Minimum Position, 2 = Set Maximum Position, 3 = Verify Calibration, 4 = Save Calibration, 5= Manual Stroke. SPC: An output to read the Fieldbus demand that comes into the block. SPC = DEMAND. POS_RDBK: Position Feedback (%): The position feedback that is used by the servo controller. If position transducer 2 is not used, Position Feedback equals Position Feedback 1. If redundant transducers are used, Position Feedback is equal to Position Feedback 1, Position Feedback 2, or the average of the two, depending on the status of the two position feedback channels

ACT_OHMS

Actuator Resistance (Ohms): The actuator resistance measured by the SPC. This value is not updated when the SPC is not positioning the actuator or when the actuator current is too low to allow reasonably accurate ohms calculations. FB_RNG_1: Feedback 1 Range Fault: The voltage on the LVDT/RVDT 1A or 1B inputs has exceeded the normal voltage range by the Feedback Range Threshold value. The normal voltage range is determined during calibration. For example, suppose that the voltage on the LVDT/RVDT 1A input changed from 2 volts to 6 volts during the calibration procedure, and Feedback Range Threshold is 0.3 V.

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