The Processor Control Panel
The control panel consists of the following:
• Display: An LED display that shows status and error messages
• Alarm signals: LED warning lights that appear below the display
• Status signals: LED lights that appear below the display
• Function keys: Twenty-three keys, used for programming the pro-
cessor
Figure 9.1. The processor control panel.
➀
Control panel display.
➁
Alarm signals.
➂
Status signals.
➃
Function keys.