7-27.1 Functions and Types7.1.1 Functions of Communication CassetteWith the optional communication cassette, the FPΣ offers three different communication modes:computer link, general-purpose serial communication, and PC(PLC) link.Computer link• The computer link function is to communicate between a computer and PLCs or between PLC andexternal devices connected. A proprietary MEWNET protocol called MEWTOCOL-COM is used forcommunicating with the computer link. MEWTOCOL-COM is also used for the communication betweenthe tool software such as FPWIN-GR and the PLC.• There are a MEWTOCOL master function and a MEWTOCOL slave function for the computer link. Theside that issues commands is called master, and the side that receives the commands, executes theprocess and sends back responses is called slave.Note:It is necessary to set the system register of the communication port to the computer link for using thisfunction.1. Only the slave function is available for the FPΣ 12k type.2. Both the master and slave functions are available for the FPΣ 32k type, however, the master functionis not available for the TOOL port.MEWTOCOL master function (32k type only)• This function is to carry out the communication on the master side (side 0that issues commands) of thecomputer link. It is executed with the PLC’s instruction F145(SEND) or F146(RECV). It is not necessaryto write the response process as a ladder, so the program is easier than the general-purposecommunication function.The 1:1 or 1:N communication is available between our devices equipped with the computer link functionand the MEWTOCOL-COM.[Our devices (e.g.)] : PLC, IPD, temperature control unit, message runner, eco-power meterFor the MEWTOCOL master function, communication is possible with COM1 port and COM2 port of the32k type only. Do not execute the F145 (SEND) nor F146 (RECV) instructions when the unti is used as aslave unit.
