Encoder is a kind of Angle displacement speed sensor device can be used to measure distance, it turns a circle a pulse signal to calculate the corresponding data for equipment to control the equipment.
Encoders connected with PLC to form a complete set, about the connection problems, we make the following assumptions: first, you set a zero switch.
Then also set the switch on the location of the need to stop,
If you can have words)
, followed by you to control the motor work, move on to what you actually need to stop location, record and save the current count value, so that you can get what you need to count any stop position, the stop position coded number, and record the corresponding count is ok, you need to stop at any position, only need the current count value compared with the count of corresponding position, control motor movements.
Current value is less than the position value, the motor movement to the left;
The current value is greater than the position, the machine movement to the right.
Into the AB PLC high-speed counting, to pick up COM about encoder (
Circuit of signal output types, mainly in view of the counter to connect the encoder signal, PLC, man-machine interface, industrial computer logic equation manufacturers, they can accept or ask for SENSOR output signal, to design, also each controller manufacturers based on features of his product, hope to match their related SENSOR output signal way features, the best quality requirement.
So when choosing the encoder must understand the customer's specifications or the use of environmental factors such as controller.
VOLTAGE type VOLTAGE: in general or special requirements for no simple equipment - electrical field work environment
With the VOLTAGE output (
The OPEN - current type
COLLECT: some customers preferences current mode (
That has a better effect on slightly interference environment, the early PLC (
Customer requirements in this specification, ENCODER manufacturers, because Japan was then unable to find a high voltage IC, therefore can only use the OPEN - current type
COLLECT circuit features, production type high voltage signal output ENCODER, formed today's PLC customers can specify the cause of the current mode.
In addition to general signal more than 3 m or more occasions, also suggest customers to use this specification, and with high voltage type, in order to avoid long distance transport, caused by voltage drop or interfere with the bad products.
3. pvsh -
: this is a kind of NPN and PNP hybrid, generally Japan (
Series product preference design NPN system, Europe and the United States like PNP system, sometimes don't know each other using NPN and PNP system, we would suggest to use PVSH -
Specifications, but one thing to note, if the system is also PVSH -
Can't use this specification.
As long as the choice of NPN and PNP either, for the company's products, we also is the main design is given priority to with NPN system, if want to pure PNP can also, but need to pay the design fee.
Moreover, PUSH -
LINEDRIVER linear differential -
Its voltage in Asia, with nearly 95% for DC5V, whereas the European and American manufacturers have DC5V, 12 v, 826 v general environmental interference sources on the spot, or signal transmission distance,
More than 5 m)
, it is recommended to use this model.
LINEDRIVER signal can deliver 100 m.
For manufacturer or unable to provide a stable power supply equipment, be sure to require the use of high voltage LINEDRIVER, avoid cannot output caused by the voltage drop, when using this circuit should pay attention to whether to accept customer's controller RS422 interface signal function, generally only PLC, man-machine interface, industrial computer has the matching function, cannot receive normal counter, pay attention to other controller can provide what kind of power to the ENCODER ENCODER is used.
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