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

ASCII Instructions 387ExampleI:110If input slot 1, bit 10 is set, search the stringin ST52:80 starting at the 36th character, forthe string found in ST38:40. In this example,the position result is stored in N10:0.ASCString SearchSource ST38:40Index 35String Search ST52:80Result N10:0Error ConditionsThe following conditions cause the controller to set the ASCII Error bit(S:5/15).• Source string length is less than 1 or greater than 82.• Index value is less than 1 or greater than 82.• Index value is greater than Source string length.The destination is not changed in any of the above conditions. When theASCII String Manipulation Error bit (S:5/15) is set, the Invalid StringLength Error (1F39H) is written to the Major Error Fault Code word (S:6).ASR - ASCII StringCompareASRASCII String CompareSource A ST10:8Source B ST10:9Instruction Type: inputExecution Time for the ASR InstructionControllerWhen Instruction Is:TrueFalseMicroLogix 1400 4.8596 µs 0.2016 µsUse the ASR instruction to compare two ASCII strings. The controllerlooks for a match in length and upper/lower case characters. If twostrings are identical, the rung is true; if there are any differences, the rungis false.Entering ParametersEnter the following parameters when programming this instruction:• Source A is the location of the first string used for comparison.• Source B is the location of the second string used for comparison.Publication 1766-RM001A-EN-P - October 2008