Rockwell Automation Publication 450L-UM001D-EN-P - December 2019 117
Status Indicators and Troubleshooting Chapter 7
Errors can be caused externally (STS =red on/off blinking) and internally (STS
= red on). Examples of external recoverable errors include: ambient light and/or
Start button fault.
If there’s an error, the second status indicator provides more information about
the root cause (Table 54 on page 118
).
The timing of the status indicator blinking defines a frequency and a duty cycle.
The frequency defines one sequence of on and off, as a default frequency 1 Hz is
used if not otherwise mentioned. The duty cycle defines the ratio of the on
duration and the off duration of the status indicator. If not otherwise mentioned,
the default value for the duty cycle is 50:50, meaning 50% on, 50% off.
ATTENTION: To indicate if a system is in the configuration mode, the STS
status indicator blinks alternately red/green (50:50; 1 Hz). The configuration
mode is not an error. It just indicates that the DIP switch configuration and/
or plug-in was changed and it must be confirmed. For normal operation, the
configuration must be confirmed first. This procedure is described in
Confirmation of a New System Configuration on page 64
.
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