PLC技术应用技术手册三菱PLCMESECMODBUS资料.pdf

SAFETY PRECAUTIONS ( R m d these precautions before using.) When using Mitsubihi e q u i p m e n t , thoroughly r e a d this manual and the associated manuals introduced in this manual. Also pay careful attention to safety andhandlethe module properly. Theseprecwtkm apply only to Mitsubishi qipment.Referto the CPU module useh manualfor a descrption ofthe PC syatem safety precautkns. These SAFETY PRECAUTIONS 0 classify the safety precautions into two c a t e g o r i e s : DANGER and CAUTION. Depending oncimmstances, procedures indicatedby A CAUTION may also be linkedto serious r e s u l t s . In any case, it is important to follow the directionsfor usage. Storethis manual in a safe placesothat you can takeit out and read 1whenever necessary. h a y s forward it to the end user. System Design Precautions] eDANGER 0 When contrdlinga PC by connecting apersonalcomputer or other similar controldevice to a s p e c i a l function module for the purposeof changingthe data, changing the program, or changingthe operation status (statuscontrol), an intertodr circuit must be configured inthe sequenceprogram sothat the entire system will always operatesafely. If a remote PC iscontrolled inthe manner indicated above byan external d e v i c e , the system may fail to respond immediately even when trouble occurs at the remOte PCdue to data communication error. Inaddition to config~nngthe interkCk circuitin a sequence program, determine the responseto be taken by the system at the occu~~enceofa data communicationerror asthe processing between the external device and the PC CPU. A CAUTlON Do not bundle control lines or communication wires together with