Production lines often use Siemens PLC as master and Mitsubishi as sub-station (or vice versa). Via the MCDLL communication library, Siemens S7-1200/1500 directly exchanges data with Mitsubishi PLCs over Ethernet — no protocol conversion gateway needed.

MCDLL Library

MCDLL is Mitsubishi's communication library callable from third-party PLCs/PCs, using MC protocol to communicate with Mitsubishi PLCs. In TIA Portal, MCDLL is encapsulated as FB blocks for cyclic read/write of Mitsubishi soft elements.

MCDLL in TIA Portal
MCDLL function block in TIA Portal
MCDLL config
MCDLL communication configuration
  • Siemens master reads Mitsubishi sub-station status
  • Cross-brand line coordination
  • Centralized data collection
  • Retrofit projects with mixed PLC brands

Communication FB includes connection management, heartbeat, read/write, and auto-reconnect. Cycle times down to 10ms. Contact us for technical details.