【正文】 ,intelligent function module,installation condition of extension cable 5) Status of wiring(I/O cables,cables) 6) Display status of various types of indicators (POWER LED, RUN LED,ERR. LED, I/O LED) 7) Status of setting of various types of set switches (Setting of No. of stages of extension base unit,power interrupt holdon status).After confirming items 1)to 7),connect the GX Developer, and check the operating conditions of the PLC and the contents of the program. (2) Check of trouble Check to see how the operating condition of the PLC varies while the PLC is operated as follows. 1) Set the RUN/STOP switch to STOP. 2) Reset the trouble with the RESET/ switch. 3) Turn ON and OFF the power supply. (3) Reduction in area Estimate the troubled part in accordance with items (1) and (2) above. 1) PLC or external devices 2) I/O module or others 3) Sequence program The CPU module returns an error code to the general data processing request origin when an error occurs and there is a general data processing request form the peripheral equipment,intelligent function module, or work system. If an error occurs,when a 西安石油大學(xué)本科畢業(yè)設(shè)計 （論文） general data processing is requested from the peripheral devices, intelligent function module,and work system. [POWER SUPPLY MODULE] POINTS 1 Overcurrent protection The overcurrent protection device shuts off the 5 V, 24 VDC circuit and stops the system if the current flowing in the circuit exceeds the specified value. The LED of the power supply module is unlit or lit dimly upon a voltage drop. If this device is activated, switch the input power supply off and eliminate the cause such as insufficient current capacity or short. Then, a few minutes later, switch it on to restart the system. The initial start for the system takes place when the current value bees normal. 2 Overvoltage protection The overvoltage protection device shuts off the 5 VDC circuit and stops the system if a voltage of to VDC is applied to the circuit. When this device is activated, the power supply module LED is switched OFF. If this happens, switch the input power OFF, then a few minutes later ON. This causes the initial start for the system to take power supply module must be changed if the system is not booted and the LED remains OFF. 3 Permissible instantaneous power failure time (1) For AC input power supply . An instantaneous power failure lasting less than 20ms will cause AC down to be detected, but operation will continue. . An instantaneous power failure lasting more than 20ms may cause the operation to continue or initial start to take place depending on the power supply load. Furthermore,by using the same AC power supply for the AC input module and the power supply module,it is possible to prevent the sensor, to which the AC input module is connected,from turning OFF when it is ON when the power is turned OFF. However, if only the AC input module is connected to the AC line, which is connected to the power suppludetection of the AC down for the power supply module may be delayed by the capacitor in the AC input module. Thus,connect a load of approx. 30mA per QX10 unit to the AC line. (2) For DC input power supply . An instantaneous power failure lasting less than 10ms (*4) will cause 24VDC down to be detected, but operation will continue. . An instantaneous power failure lasting more than 10ms (*4) may cause the 西安石油大學(xué)本科畢業(yè)設(shè)計 （論文） operation to continue or initial start to take place depending on the power supply load. (1: This is for a 24VDC input. This is 10ms or less for 24VDC or less.) [EMC AND LOW VOLTAGE DIRECTIVE] The PLC is open equipment and must be installed within a control cabi for not only ensures safety but also ensures effective shielding of PLCgenerated electromagic noise. (1) Control cabi (a) Use a conductive control cabi. (b) When attaching the control cabi39。s Manual describes the hardware specifications and handling methods of the Process Manual also describes those items related to the specifications of the power supply module, main base unit, extension base unit, extension cable, memory card and Process CPU is a process controlpatible CPU on the High Performance model QCPU, the Process CPU has the following additional instructions and functions. ? Process control instructions: 52 instructions ? Auto tuning function ? Online module change ? MELSECNET/H multiplex remote I/O system patibility Process CPU has the following new features: (1) 52 instructions added as process control instructions 52 additional instructions are capable of highlevel process control. (2) 2degreeoffreedom PID control system The 2degreeoffreedom PID control system adopted enables optimum response to both set value variation and disturbance variation. (3) Addition of auto tuning function (PID constant initial value setting) The auto tuning function automates control parameter adjustment, shortens 西安石油大學(xué)本科畢業(yè)設(shè)計 （論文） adjustment, saves the labor of operators and control engineers, and resolves differences in adjustment results between individuals. (4) Module can be changed online (online module change) When a module fails, you can change it without stopping the module change applies to the Q series I/O modules and to the A/D converter, D/A converter, thermocouple input and temperature control modules of function version C and later. (5) Multiplex remote I/O system of MELSECNET/H can be configured by mounting the remote master station of the MELSECNET/H, you can configure the multiplex remote I/O system of the MELSECNET/H. (6) Compatibility with processcontroldedicated software package Use of PX Developer allows PID control programs to be created easily with function blocks. Combination with the process control software package (PX Developer) provides