Absolute rotary encoder P**58
Appendix
Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany
Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com
Date of issue 01/15/04
43
Problem
The PLC and master connection are turned on and the bus is active, but the absolute
encoder is not reporting.
Solution
First, check the status of the LEDs in the connection hood (see section 6.3). In some
cases this will allow you to draw conclusions to determine what the cause of the error
is.
• Both LEDs off: Check the power supply!
• Both LEDs on: The device is not receiving any parameters or configuration data.
Check the address setting in the connection hood. Check for correction connection
of bus lines (BUS IN/BUS OUT). Check projecting.
• Red LED on, green LED flashing: Parameter error! Check parameter assignment:
(for example the overall resolution (see section 4.1.6)
Problem
Bus malfunctions occur sporadically.
Possible cause
Terminating resistors not correct
Solution
Check terminating resistors!
A terminating resistor of 220 Ω must be switched into the circuit at the beginning and
end of the bus segment. Measure the resistance between the two data lines! To do
this, turn off the power supply and measure in the connection hood between
connections "A" and "B". The measured resistance value must be approximately
110 Ω (parallel 220 Ω).
Problem
Bus malfunctions occur sporadically.
Possible cause
EMC problems
Solution
Check whether the baud rate that is set is permissible for the line length. It may be
necessary to use a lower baud rate. Check the connection hood to ensure the shield
is connected properly and that the cable is laid properly for EMC.
To Next Page
Loading...
Need help?
General
