RELIANCE 57C404C Communication module

The SPC performs multiple diagnostic functions as described in the User Guide of the SPC Service Tool. Following are some details on the hardware-specific aspects of these diagnostic functions: Driver Current Error Threshold: Demanded current does not match measured current to within ±20 %. Driver Overcurrent Threshold: Measured current exceeds demanded current by more than 25 %. Approximate Actuator Open Threshold (minimum): 13/(maximum required current, in amps) The open threshold varies with current. The lowest open threshold occurs at the highest required output current. For example, if the maximum current required is 120 mA, the lowest value that will count as an open is 13/0.120 = 108 Ω.

Approximate Actuator Shorted Threshold

1/(full scale current, in Amps) ohms, where full scale current is the driver current range displayed on the service tool. For example, if the driver current range is ±100 mA, the short threshold is (1/0.100) = 10 Ω. Exciter Voltage Tolerance: ±0.2 V (rms) System Diagnostics: Memory test, continuous monitoring of internal supply voltages, A/D converter reference check, hardware CPU power monitor, software watchdog timer DeviceNet Communication Communications between the SPC and its Faults: assigned master have stopped or slowed to less than 200 ms.

Pollution Resistance 

 Particulate Pollution IEC 664-1 Pollution Degree 2 (Normally only Resistance: nonconductive pollution occurs. Temporary conductivity caused by condensation is to be expected.) Gaseous Pollution The polyacrylate conformal coating withstands Resistance: NO2, CO2, SO2, and H2S gases per IEC 60068-2-60: 1995 Part 2.60 Method 1 and 4 (Flowing Mixed Gas Corrosion Test). It will withstand levels typical of telecommunications and computer installations as defined by Battelle Labs Class III (between IEC 60721-3-3 classification 3C1 and 3C2, light industrial to urban industrial, heavy traffic).

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