gsjhand
Electrical
- Jul 17, 2007
- 34
Hello Everybody
I have a question regarding encoder voltages. I have an encoder with input voltage 24 volts. Output of this encoder is connected to two devices PLC and Optoisolator. Output of Optoisolator is further connected to two different PLCs.
If I leave encoder output unconnected and check voltage level at output A with respect to 0Volts, using oscilloscope I get 24 Volts pulses which seems to be normal as input is 24 volts. As soon as I connect this output to any device (PLC or Isolator) voltage level drops to 12 volts. Is this normal? If I connect that PLC to output of isolator then output level of isolator remains 24 volts. This makes me to believe that this is the property of encoder which drops the voltage. But why voltage doesn’t drop when I connect my oscilloscope as this is also a device? I am guessing this is related to input impedences of the devices but not sure and would like to know more about encoders.
I have a question regarding encoder voltages. I have an encoder with input voltage 24 volts. Output of this encoder is connected to two devices PLC and Optoisolator. Output of Optoisolator is further connected to two different PLCs.
If I leave encoder output unconnected and check voltage level at output A with respect to 0Volts, using oscilloscope I get 24 Volts pulses which seems to be normal as input is 24 volts. As soon as I connect this output to any device (PLC or Isolator) voltage level drops to 12 volts. Is this normal? If I connect that PLC to output of isolator then output level of isolator remains 24 volts. This makes me to believe that this is the property of encoder which drops the voltage. But why voltage doesn’t drop when I connect my oscilloscope as this is also a device? I am guessing this is related to input impedences of the devices but not sure and would like to know more about encoders.