INTERPROCESSOR COMMUNICATION METHOD

摘要

The inter-processor communication is executed using a dual ported RAM, ordinary message communication between user programs is processed by falling and emergency message communication is executed by interrupt. The method comprises the steps of: (A) checking that input message transmitted from an user function block is emergency message or ordinary message; (B) storing input message on a transmitter dual ported RAM according to the checked result in the step (A); (C) sending message in transmitter dual ported RAM to receiver dual ported RAM; and (D) sending message in receiver dual ported RAM to receiver user program.