LINK SYSTEM FOR PROGRAMMABLE CONTROLLER

• Main Author: SHIGEMATSU HISASHI
• Format: Patent
• Language: English
• 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

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.