1, how can the length of a switch in the PLC to control the length of the output voltage? The longer the input switch closure time, the higher the output voltage, which type of PLC to choose?
2, in the input to a signal, the PLC internal program can control the output voltage from a specific value of a linear transformation to another value?
3, PLC can directly drive the load? The load is a DC solenoid with a power of 30W.
You can need to add analog expansion module but is a level of voltage changes rather than stepless changes should be used to control the timing is only a very short time interval and the output of the analog signal and then through the amplifier output control voltage on the line because the PLC The rated voltage on the point of the estimated that you can not reach the requirements of the PLC is not directly add the load are generally added to the middle of the relay or the rules do not lose the craft Oh
This ah that plus a directive is essential, you do not add a command to achieve a switch control! There are voltage high-end output that is related to the COM
The first question, here to use the PLC's analog expansion module, in the PLC by a switch the length of the closing time to control the output voltage level, you can use the timer in the program, the switch closed time to time, Time to reach a certain range, the program set the output voltage for the analog value, the longer the output of the analog voltage value is greater, as to choose the kind of PLC that there is no fixed index, because the major Mainstream manufacturers are equipped with analog modules of the expansion module, such as Siemens, Omron, Mitsubishi, etc., personally recommend the use of Siemens, Germany's product quality is excellent.
The second question, where the input signal input is divided into two kinds, one digital, the second is the analog, which depends on what your input signal is specific, by the PLC internal program control output voltage by a The specific value is linearly transformed to another value, where it is first necessary to create a specific value for it and then change the refresh of your input signal to another value, where the program is achievable and, of course, A timing problem, but the timing unit by you, to be a linear time is naturally as short as possible, each scan cycle can refresh the output can solve this problem.
The third problem, can not, the general PLC output is not used to drive the load, because the current is too large will damage the output point, which is a protective measure, it is not allowed to directly drive the load
The above answer may be some missing or wrong, the shortcomings also hope that the sea Han, hoping to help you
