LINK SYSTEM FOR PROGRAMMABLE CONTROLLER

PURPOSE:To automatically change a system without turning off a power source by writing system data set by a CPU module in an IF module at the time of changing the system. CONSTITUTION:A signal processing circuit 22 of an IF module 20 of a master station self-diagnosis its own system after the power...

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Bibliographic Details
Main Author SHIGEMATSU HISASHI
Format Patent
LanguageEnglish
Published 05.01.1990
Subjects
CONTROL OR REGULATING SYSTEMS IN GENERAL
CONTROLLING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
FUNCTIONAL ELEMENTS OF SUCH SYSTEMS
MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS
PHYSICS
REGULATING
SELECTING
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Summary:PURPOSE:To automatically change a system without turning off a power source by writing system data set by a CPU module in an IF module at the time of changing the system. CONSTITUTION:A signal processing circuit 22 of an IF module 20 of a master station self-diagnosis its own system after the power source is turned on. When this system is normal, it is checked whether setting of system data of a CPU module 10 is completed or not. When it is completed, contents of a RAM 13 of the module 10 are read in and are stored in a shared RAM 21. Setting of the master station itself is checked; and when it is normal, it is discriminated whether the link confirmation sequence is normal or not, and a link confirmation completion flag is set. Thereafter, transmission data is read from the module 10 to transmit and receive data in accordance with the communication sequence. Data is received from a slave station, and this reception data is written in the RAM 21, and further, reception data is written in the RAM 13 of the module 10.
Bibliography:Application Number: JP19880135711