Foxboro P0973JX Ethernet Module

Description

The 150W redundant power supply (P0973JX) can supply redundant power for the P0973JM, P0973JN, P0973JP, P0973KJ, or P0973LK (SecureStack family of switches) and RH102AD, RH102AM, RH102AN, RH102AP, or RH102AY (Summit family of switched) managed switches.

The hardware failure of PLC can be easily detected, and the basic method of maintenance is to replace the module. Judging the faulty module based on the fault indicator light and fault phenomenon is the key to maintenance, and blind replacement can bring unnecessary losses.

(1) Power module failure
A functioning power module should have working indicators such as “AC”, “24VDC”, “5VDC”, “BATT”, etc. that are permanently green. If the color of any of the lights changes, flashes, or goes out, it indicates that there is a problem with that part of the power supply. The “AC” light indicates the AC main power supply of the PLC. When the “AC” light is not on, there is mostly no working power supply, and the entire PLC stops. At this point, it is necessary to check whether the power fuse has blown. To replace the fuse, use a fuse of the same specification and model. If there is no imported fuse of the same model, use a fast fuse with the same current instead. If the fuse is repeatedly burned, it indicates a short circuit or damage to the circuit board. Replace the entire power supply. When the “5VDC” and “24VDC” lights are off, it indicates that there is no corresponding DC power output. When the power deviation exceeds the normal value by 5%, the indicator light flashes. Although the PLC can still work at this time, attention should be paid to it and it should be shut down for maintenance if necessary. The “BATT” color changing light is the backup power indicator light, which is normal in green, low in yellow, and faulty in red. When the yellow light is on, the backup battery should be replaced. The manual stipulates that the lithium battery should be replaced once every two to three years. When the red light is on, it indicates a fault in the backup power system and the entire module needs to be replaced.

(2) I/O module failure
The input module is generally composed of optoelectronic coupling circuits; Output modules include relay output, transistor output, photoelectric output, etc. according to different models. Each input and output point has corresponding LED indications. When there is an input signal but the point is not lit, or when it is confirmed that there is an output but the output light is not lit, it should be suspected that the I/O module is faulty. The input and output modules have 6 to 24 points, and it is not cost-effective to replace the entire module just because one point is damaged. The usual approach is to find an alternative point and then change the corresponding address in the program. However, it should be noted that the larger size of the program makes it difficult to find specific addresses. It is particularly emphasized that whether replacing the input module or the output module, it must be carried out when the PLC is powered off, and S5 live plugging and unplugging modules are absolutely not allowed.

(3) CPU module failure
The CPU module of a general-purpose S5PLC often includes communication interfaces, EPROM slots, running switches, etc., making faults more hidden. Due to the high cost of replacing the CPU module, fault analysis and judgment should be particularly careful.
Maintenance example: When a PLC is powered on, it is unable to turn the switch to the RUN state. The error indicator light first flashes and then remains on. After power outage and reset, the fault persists. After replacing the CPU module, it operates normally. During chip level maintenance, the CPU was replaced, but the fault light continued to flash continuously. It was not until the communication interface board was replaced that the function returned to normal.

WOODWARD Product Recommendation:
9907-205
9907-167
9907-166
9907-164
9907-163
9907-162
9907-149
9907-1200