IEC 60870-5-103 protocol in Mitsubishi Posted Wednesday at 2:14 AM 16 hours ago, Inntele said: Keep in mind, the reliability of OWEN PLCs is in times lower than Mitsu provide, while I suppose the application requires the use of reliable equipment. If you're looking to the side "ПЛК100-ТЛ", rather it belongs to the class of intelligent relays than to a PLC. I understand that. This system only provide parameters indication and failure of equipment will not hurt anything, but its undesirable of course. I would be happy if mitsu have something with 103 protocol, but they dont. Maybe you can advice something? We cant afford Siemens (quite high price for such small system). And i dont know anything about writing of communication drivers.