1766-RM001A-EN-P MicroLogix 1400 Programmable Controllers ...

304 Input and Output InstructionsThe IIM instruction allows you to selectively update input data withoutwaiting for the automatic input scan. This instruction uses the followingoperands:• Slot - This operand defines the location where data is obtained forupdating the input file. The location specifies the slot number andthe word where data is to be obtained. For example, if slot = I:0,input data from slot 0 starting at word 0 is masked and placed ininput data file I:0 starting at word 0 for the specified length. If slot =I:0.1, word 1 of slot 0 is used, and so on.IMPORTANTSlot 0 is the only valid slot number that can be used with thisinstruction. IIM cannot be used with expansion I/O.• Mask - The mask is a hex constant or register address containing themask value to be applied to the slot. If a given bit position in themask is a “1”, the corresponding bit data from slot is passed to theinput data file. A “0” prohibits corresponding bit data in slot frombeing passed to the input data file. The mask value can range from0…0xFFFF.Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0Real Input Input WordMask 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1Input DataFileData is Not UpdatedUpdated to Match Input Word• Length - This is the number of masked words to transfer to theinput data file.Addressing Modes and File Types can be used as shown below:IIM Instruction Valid Addressing Modes and File TypesFor definitions of the terms used in this table see Using the Instruction Descriptions on page 92.ParameterOISBT, C, RNData FilesFSTLFunction FilesMG, PDRI/RIXPLSRTCHSCPTOX, PWMXSTIEIIBHIMMILCDAddressModeAddress LevelCS - CommsIOS - I/ODLS - Data LogImmediateDirectIndirectBitWordLong WordElementSlot • • • •Mask • • • • • • • • •Length•Publication 1766-RM001A-EN-P - October 2008