Status Indicators; Mode Switch Functions - Automationdirect.com DirectLOGIC DL205 Series User Manual

Chapter 3: CPU Specifications and Operations

Status Indicators

The status indicator LEDs on the CPU front panels have specific functions which can help in
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programming and troubleshooting.
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3
4
5
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Mode Switch Functions

The mode switch on the DL240, DL250–1 and DL260 CPUs provides positions for
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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
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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
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will be allowed through the connected programming or monitoring device.
There are two ways to change the CPU mode.
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• 1. Use the CPU mode switch to select the operating mode.
• 2. Place the CPU mode switch in the TERM position and use a programming device to change
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NOTE: If the CPU is switched to the RUN Mode without a program in the PLC, the PLC will produce a
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FATAL ERROR which can be cleared by cycling the power to the PLC.
Mode Switch Position
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RUN (Run Program)
A
TERM (Terminal)
B
STOP (DL250–1 and DL260 only Stop Program)
C
D
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DL205 User Manual, 4th Edition, Rev. B
Indicator
ON
PWR
OFF
ON
RUN OFF
Blinking
ON
CPU
OFF
ON
BATT
OFF
operating modes. In this position, you can change between Run and Program modes.
Status
Power good
Power failure
CPU is in Run Mode
CPU is in Stop or program Mode
CPU is in Firmware Upgrade Mode
CPU self diagnostics error
CPU self diagnostics good
Low battery voltage (only with System
Memory bit B7633.12 set)
CPU battery voltage is good or disabled
CPU is forced into the RUN mode if no errors are encountered. No
changes are allowed by the attached programming/monitoring device.
RUN, PROGRAM and the TEST modes are available. Mode and program
changes are allowed by the programming/monitoring device.
CPU is forced into the STOP mode. No changes are allowed by the
programming/monitoring device.
Meaning
CPU Action