Change Excitation Mode, Command #8270

Use this command to temporarily change the excitation supplied to the loadcell.

This method is intended to use only for diagnostic purposes,such as when using a DC milli-voltmeter.

Note ♦	Changing the excitation mode may add an offset to the A/D measurements. Therefore, the system should be calibrated using the same excitation mode the loadcell will work with.
♦	In general, the working excitation mode should be set via Hardware Configuration.
♦	The Change Excitation command overrides the hardware configuration excitation setting until the next system reset / power-up.
♦	Changing excitation mode may cause a momentary conversions-break (about 300msec) due to filter reset.

Command parameters

SI 141

Determines which excitation mode, the Loadcell number, and the DIN rail location of the module. Four digits are stored in SI 141.

Mode

LC #

DIN Location

0=DC

1=AC

0-2

Always 0

0-7

To switch LC3, located on the last module on the DIN rail, to DC mode, store 207 into SI 141. To switch to AC mode, store 1207.

SI 142

MI address; this MI will contain the Command Status indication

SI 140

Command number:#8270