The 1785-L30B is fitted with a battery that will be available for use by the controller in the event of a power failure. The battery is used to hold user and programme data stored in the controller’s user memory. It is equipped with a BATT LED to report the current level of the battery. For the 1785-L530B, the battery will last 84 days at 100% shutdown and 150 days at 50% shutdown at an operating temperature of 60 degrees Celsius.

When the BATT LED is on, the battery will continue to operate for 5 days from the first appearance of the signal. When the battery is fully depleted, the contents of the user memory will remain unchanged unless the controller is powered on. The contents of the user memory are erased only when power is lost and the battery is depleted.

The 1785-L30B has two built-in ports such as Channel 1A and Channel 1B. These ports can be configured as Remote I/O Scanners, Remote I/O Adapters, and DH+ communication interfaces. In addition, the 1785-L30B controller provides a 25-pin connector serial port interface.

The serial port supports the RS232C standard and can be configured for system protocols such as ASCII and DF1. full-duplex and half-duplex master protocols, and half-duplex slave protocols. An 8-pin miniature DIN connector labelled Channel 1A is also available and also supports DH+ connectivity.

The 1785-L30B has several indicator lights on the front panel for easy interaction with the user. These indicators are labelled BATT and are used to show battery status.

The indicator labelled PROC indicates the status of the controller. the FORCE indicator is used to show whether or not the I/O force is enabled. the COMM indicator is connected to channel 0 and is used to report communication activity, while channels 1A and 1B both have dedicated status indicators.

The controller has a three-position pushbutton switch to set the controller mode. Each position corresponds to one of the processor modes, such as Run, PROG, and REM In Run mode, the controller executes the program and activates the output devices PROG stops the execution of the logic and allows the controller to be configured and programmed REM executes the logic and allows configuration and programming.