CPU Specifications
and Operation
4–6
CPU Specifications and Operation
Status Indicators
Mode Switch
The status indicator LEDs on the CPU front panels have specific functions which can
help in programming and troubleshooting.
Indicator Status Meaning
PWR ON Power good
OFF Power failure
RUN ON CPU is in Run Mode
OFF CPU is in Stop or program Mode
CPU ON CPU self diagnostics error
OFF CPU self diagnostics good
TX1 ON Data is being transmitted by the CPU - Port 1
OFF No data is being transmitted by the CPU - Port 1
RX1 ON Data is being received by the CPU - Port 1
OFF No data is being received by the CPU - Port 1
TX2 ON Data is being transmitted by the CPU - Port 2
OFF No data is being transmitted by the CPU - Port 2
RX2 ON Data is being received by the CPU - Port 2
OFF No data is being received by the CPU - Port 2
The mode switch on the DL05 PLC provides positions for enabling and disabling
program changes in the CPU. Unless the mode switch is in the TERM position, RUN
and STOP mode changes will not be allowed by any interface device, (handheld
programmer, DirectSOFT programing package or operator interface). Programs
may be viewed or monitored but no changes may be made. If the switch is in the
TERM position and no program password is in effect, all operating modes as well as
program access will be allowed through the connected programming or monitoring
device.
Status Indicators
Mode Switch
Functions
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