Type selection of PLC in the process of PLC and its contents and methods of the hardware configuration

Different types of PLC controller have different hardware and performance indicators. The basic I/O points and extended range, are often very different program storage capacity. Therefore, before the PLC program design, to the type of PLC used, hardware configuration, Such as whether to increase additional built-in type PLC I/O board, general-purpose PLC whether to increase the I/O templates, etc. ) To make a choice. ( 1) Input/output point input point is related to the controlled machine tool side button, switch, relay and contactor contact connection of the input signal interface, and by the side of machine tool directly connected to the input signal interface (NC , SKIP the signal: the SKIP, etc. ) 。 Output point including relay to machine side, light output signal interface, etc. The designer of the controlled object of the I/O signals to confirm, and respectively calculate the total number needed. Selection of I/O points of PLC should be a little more than calculate the I/O points, for the change control performance and possible additional needs. ( 2) Storage capacity in general, common CNC lathe order program step size of about 1000, about 2000 small machining center. Program size changes with the complexity of the machine tool, the designer according to the specific tasks to program size estimation, accordingly to determine a reasonable storage capacity. The processing time, in addition, the selected PLC instruction function, timer, counter, internal relay technology indicators should meet the requirements specification, quantity, etc.
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