FOXBORO AD202MW Controller
The maintenance content of DCS is numerous and complex, so when there are faults, it is easy to have no clue. Generally, common faults can be started from the following eleven directions:
4. Error in address flag
Whether it is a local component or a bus interface, if its address identification is incorrect, it will inevitably cause communication network disorder. Therefore, it is necessary to prevent address identification errors of each component and prevent human error and modification. When expanding the system, it should generally be done when the system is stopped. Especially for systems using token based communication, any increase or decrease in composition must be reported to the network during system shutdown to avoid unpredictable consequences.
5. Hardware failure
The DCS system can be divided into human-machine interface faults and process channel faults based on the different functions of each hardware. The human-machine interface mainly refers to the engineer station, operator station, printer, keyboard, mouse, etc. used to achieve human-machine communication functions; Process channels mainly refer to local buses, channels, process processors, primary components or control equipment, etc. The human-machine interface consists of multiple workstations with the same function. When one of them malfunctions, as long as it is handled promptly, it generally does not affect the monitoring operation of the system. When a process channel fault occurs on the local bus or primary device, it will directly affect the control or detection function, resulting in serious consequences.
6. Human machine interface failure
Common human-machine interface faults include mouse operation failure, control operation failure, operator station crash, abnormal membrane keyboard function, printer malfunction, etc. Abnormal mouse operation is generally due to long-term aging or pollution of internal mechanical devices, which makes the contacts unreliable to connect or disconnect, or the lack of communication with the host due to unstable cable insertion. In this case, it is only necessary to replace and inspect it.
The failure of control operation is due to the inability of the mouse operation signal to change the state of the process channel. On the one hand, it may be a hardware failure of the process channel itself, and on the other hand, it may be a software defect of the operator station itself, which causes non response when the equipment is overloaded or there are too many open process windows. After checking that the channel function is normal during the process, the operator station should be checked and restarted if necessary to initialize the operator station. There are many reasons for the operator station to crash, possibly due to hard disk or card failures, or software defects.
FBM201 8-channel 0-20MA input interface assembly 8AI
FBM201 P0914SQ 8-channel 0-20mA input interface assembly
FBM201b 8-channel 0-100MV input interface assembly 8AI
FBM201b P0922YH 8-channel 0-100mV input interface assembly
FBM201c 8-channel 0-5VDC input interface assembly 8AI
FBM201c P0922YJ 8-channel 0-5V input interface assembly
FBM201d 8-channel 0-10VDC input interface assembly 8AI
FBM201d P0922YK 8-channel 0-10V input interface assembly
FBM202 8-channel thermocouple/millivolt input interface assembly 8T/C
FBM202 P0926EQ 8-channel thermocouple/millivolt input interface assembly
FBM203 8-channel thermistor input interface assembly (Platinum) 8RTD
FBM203 P0914SV 8-channel 0-320 thermal resistance input interface assembly
FBM203b 8-channel thermistor input interface assembly (Nickel) 8RTD
FBM203b P0922UA 8-channel 0-640 thermal resistance input interface assembly
FBM203c 8-channel thermal resistance input interface assembly (Copper) 8RTD
FBM203c P0922UD 8-channel 0-30 thermal resistance input interface assembly
FBM204 8-channel 0-20MA input interface assembly 4AI/4AO
FBM204 P0914SY 8-channel 0-20mA input and output interface assembly
FBM205 P0914XG redundant 8-channel 0-20mA input/output interface assembly
FBM206 8-channel pulse input interface assembly 8PI
FBM206 P0916CQ 8-channel pulse input interface assembly
FBM207 16-channel voltage monitoring input interface assembly 16DI
FBM207 P0914TD 16-channel voltage monitoring · visual input interface assembly (optional redundancy)
FBM207b 16-channel 24VDC contact input interface assembly 16DI
FBM207b P0914WH 16-channel 24Vdc contact input interface assembly (optional redundancy)
FBM207c 16-channel 48VDC contact input interface assembly 16DI
FBM207c P0917GY 16-channel 48Vdc contact input interface assembly (optional redundancy)
FBM208 P0914TB 4-channel 0-20mA input/4-channel 0-20mA output assembly
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