Instructions

LED indicators and troubleshooting | I/O modules
288 1432790000/03/02.2014Manual u-remote
Module LED Status Recommended action
UR20-8AI-I-PLC-INT
Status LED Red:
– Error in the supply voltage
– Communication error on the system bus
– There is a new diagnostic message
– Channel error
– Error on the supply voltage of the feed in plug
– Check that the module has been snapped into place
properly
– Check the supply voltage
– Check channel error
– Check supply voltage of feed in plug
Status LED off and all other LEDs red:
– Error in the bus coupler power supply – Check the bus coupler supply voltage
Channel LED
1.0 ... 1.7
Red:
– Input signal outside permissible range
– System bus cannot be accessed (e.g. caused by
interruption of the bus coupler power supply)
– Check the input signal
– Check the bus coupler supply voltage
4.1 Green: Supply voltage feed in plug >18V DC
4.2 Red: Error on the supply voltage of the feed in plug
– Check supply voltage of feed in plug
4.4 Red:
– Fuse for the sensor supply has been triggered – Check the load connected to the sensor supply
UR20-4AI-TC-DIAG, UR20-4AI-RTD-DIAG
Status LED Red:
– Error in supply voltage at input current path
– Communication error on the system bus
– There is a new diagnostic message
– Channel error
– Firmware error
– Check that the module has been snapped into place
properly
– Check the supply voltage
– Check channel error
– Check firmware, update firmware as nessecary
Status LED off and all other LEDs red:
– Error in the bus coupler power supply – Check the bus coupler supply voltage
Channel LED
1.1 ... 4.1
Red:
– Input signal outside the permissible range
– Cable break
– Cold-junction compensation error (UR20-4AI-TC-DIAG
only)
– System bus cannot be accessed (e.g. caused by
interruption of the bus coupler power supply)
– Check the input signal, the cabling and, if necessary, the
sensor for external cold-junction compensation.
– Check the bus coupler supply voltage
UR20-4AO-UI-16
Status LED Red:
– Error in the supply voltage
– Communication error
– Channel error
– Check that the module has been snapped into place
properly.
– Check the supply voltage
– Check the channel error
Status LED off and all other LEDs red:
– Error in the bus coupler power supply – Check the bus coupler supply voltage
Channel LED
1.1 ... 4.1
Red:
– Overload in voltage mode
– Broken wire in current mode
– System bus cannot be accessed (e.g. caused by
interruption of the bus coupler power supply)
– Check the connected load, check the cabling,
– Check the bus coupler supply voltage