Indicates materials are ready for processing. It is comprised of a series of bits with 1 equalling ready or not low, 0 equalling not ready, or low. Each bit represents a different user material. The word contains bits that indicate when a critical material or process parameter is ready for use. It can also be used for production, and/or indication of low condition. This information may be sent to the unit machine at any time as the interlock information changes.

The format and meaning of the material interlock bits are determined by the machine/unit supplier, as shown in the example below:

Machine/Unit	Material Interlock Bit #	Material Description
Filler	0	500 ml Bag
Filler	1	Flacked Cereal
Labeler	0	Small Box
Labeler	1	500 ml Bag
Labeler	2	Small Box Label