Abstract: A programming device for preparing a sequence control program to be executed by a programmable sequence controller comprises designation means for designating input and output (I/O) elements specified in the sequence control program which are to be fixed to ON or OFF states regardless of the actual ON or OFF states of the designated I/O elements, fixed I/O element converting means for converting the address of each of the I/O elements designated to be fixed by the designation means into either a memory storing address ON-state or another memory address storing OFF-state so as thereby to prepare a modified sequence control program, and loading means for loading the modified sequence control program to the programmable sequence controller being connected to the programming device.

Abstract: A programmable controller (PC) for controlling equipments in accordance with a sequence program. A program memory is provided with an equipment code storage region for storing global equipment codes for indicating the equipments each of which is allotted an individual I/O address. When an equipment code is input, an equipment code interpreter determines the local I/O address which corresponds to the equipment code. The equipment code is composed of a PC number code, an equipment type code, an equipment number code and the like. The equipment code is displayed together with the sequence program.

Abstract: A programmable control system for controlling a multiplicity of equipments by a plurality of programmable controllers (PC's) in parallel. Each PC is provided with a program linkage condition memory. The linkage conditions are the conditions for linking sequence programs to each other which are stored in the respective programmable controllers at the time of reading out the sequence programs in series. When a predetermined read command is issued, the sequence programs stored in the respective PC's are successively read out in accordance with the linkage conditions and are displayed on a display unit.

Abstract: A programmable control comprising a plurality of programmable controllers (PC's) for executing parallel control. Each PC is provided with a link control table for storing the numbers of the PC's to which link data such as interlock information is supplied. In each PC, a link data file in which link data to be required are listed is created. The link data file is circulated to each PC. Each PC creates a link control table in accordance with the contents of the received link data file.