Removing a Manual Configuration
After a manual configuration, the system will automatically retain the new I/O addresses
through a power cycle. You can remove (overwrite) any manual configuration changes by
changing all of the manually configured addresses back to automatic.
Power–On I/O Configuration Check
The DL205 CPUs can also be set to automatically check the I/O configuration on power-up.
By selecting this feature you can detect any changes that may have occurred while the power
was disconnected. For example, if someone places an output module in a slot that previously
held an input module, the CPU will not go into RUN mode and the configuration check will
detect the change and print a message on the Handheld Programmer or DirectSOFT screen
(use AUX 44 on the HPP to enable the configuration check).
If the system detects a change in the PLC/Setup/I/O configuration check at power-up, error
code E252 will be generated. You can use AUX 42 (HPP) or DirectSOFT I/O diagnostics to
determine the exact base and slot location where the change occurred. When a configuration
error is generated, you may actually want to use the new I/O configuration. For example, you
may have intentionally changed an I/O module to use with a program change. You can use
PLC/Diagnostics/I/O Diagnostics in DirectSoft or AUX 45 to select the new configuration,
or, keep the existing configuration stored in memory.
WARNING: You should always correct any I/O configuration errors before you place the CPU into RUN
mode. Uncorrected errors can cause unpredictable machine operation that can result in a risk of
personal injury or damage to equipment.
WARNING: Verify the I/O configuration being selected will work properly with the CPU program. Always
correct any I/O configuration errors before placing the CPU in RUN mode. Uncorrected errors can cause
unpredictable machine operation that can result in a risk of personal injury or damage to equipment.
DL205 User Manual, 4th Edition, Rev. B
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Chapter 4: System Design and Configuration
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