FOXBORO thermistor input/output module P0903ZE card

Description

Due to the mixing of conductive foreign objects inside the PLC or the influence of external abnormal noise, the CPU loses control or the calculation cycle exceeds 200ms, resulting in a WDT error. The [EPROR] LED light is on, the PLC is in STOP, and all outputs become OFF. At this point, a power outage reset can be performed. If the PLC returns to normal, please check for any abnormal noise sources and the mixing of conductive foreign objects. Additionally, please check if the grounding of the PLC meets the requirements.

If there is a change in the [EPROR] LED light from on to flashing during the inspection process, please perform a program check. If the [EPROR] LED remains on all the time, please confirm if the program calculation cycle is too long (monitor D8012 to determine the maximum scanning time).

Regardless of whether the LED light of the input unit is on or off, please check whether the input signal switch is indeed in the ON or OFF state. If the rated current capacity of the input switch is too large or due to oil intrusion or other reasons, it is easy to cause poor contact. When the input switch and LED light are connected in parallel with a resistor, even if the input switch is OFF but the parallel circuit is still connected, the PLC can still be input. If input devices such as light sensors are used, the sensitivity may change due to dirt adhering to the emitting/receiving parts, which may not fully enter the “ON” state. Unable to receive ON and OFF inputs in a shorter period of time than the PLC operation cycle. If different voltages are applied to the input terminals, it will damage the input circuit.

Regardless of whether the LED light of the output unit is on or off, if the load cannot be turned on or off, it is mainly due to overload, short circuit of the load, or impact current of capacitive load, which causes the output contact of the relay to bond or poor contact surface, resulting in poor contact.

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