中文版
Description
1, general auxiliary relay FX series PLC general auxiliary relay has no power failure protection function. In the FX series PLC, except for the input and output relays, the component numbers of other programming components are in decimal.
Power failure protection diagram
Power failure protection diagram
If the power supply is suddenly interrupted when the PLC is running, the output relay and the general auxiliary relay will all become OFF. If the power supply is turned ON again, the rest will remain OFF except for those that become on due to external input signals.
12HFA51A42H12HFA51A42H
2 Battery backup/Latch auxiliary relays Some control systems require memory of the new instantaneous state of the power supply and reproduction of its state after re-powering. Battery backup/latch auxiliary appliances can be used in such cases to retain the contents of image registers in RAM with hammer batteries when the power supply is new, or to save them in EEPROM. These are only maintained in a transient state during the first person-scan cycle (after re-energizing). In order to make use of their power-off memory function, a circuit with memory function can be adopted. Let X0 and X1 in Figure 3-7 be the start button and the stop button respectively, and M500 controls the external motor through Y0. If the M500 is in 1 state when the power is interrupted, because of the memory function of the circuit, the M500 will remain in | state after re-energization, making YO continue to be ON. The motor starts running again. 3, special auxiliary relay
Special auxiliary appliances total 256 points, they are used to represent certain states of C, provide clock pulses and signs/such as carry, borrow signs), set the mode of operation of C, or for step control, alarm interrupt, set the counter whether to add or subtract count. Special auxiliary relays are divided into two categories:
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