Interface Description
IGSS32 offers a serial interface for the Mitsubishi Melsec A/AnS type PLC equipment. The Melsec-A communications protocol enables Mitsubishi PLCs to communicate with external devices such as computers running IGSS32, printers, CRTs etc using RS-232C and RS-422 serial interfaces.
An AJ71C24 or compatible interface board must be installed in the Melsec-A/AnS PLCs in order make a point-to-point connection. The point-to-point connection can be extended to a multidrop network by connecting two or more PLCs.
The communication interface supports both direct and dialled-up connections.
The IGSS32 system polls the PLC equipment cyclically according to one of four user-defined time intervals. The time intervals are configurable from 100 milliseconds to 999 seconds. The system automatically groups process data in data blocks – thus fully exploiting the the communication link in relation to the present configuration.
NOTE: The IGSS32 serial interface driver is compatible with the TCP/IP based Ethernet driver for Mitsubishi Melsec-A/AnS PLCs. This means that no changes has to be made.
Technical Data
| Electrical Interface | : | RS232 |
| Protocol | : | Mitsubishi Melsec-A format 1 protocol |
| Types of data | : | String, Fixed point 8, 16, 32, BCD 16, 32. |
| PLC types supported | : | All Mitsubishi PLCs types supporting the AJ71C24 (or compatible) interface board. E.g. A1-, A2-, A3-, AnS etc. type CPUs. |
| Addressing | : | Node (PLC), data type (D, R, T, C and expanded D areas), Area index, bit offset (a whole number of words is read or written) |
| Supported platforms | : | Windows Vista, Windows XP, Windows 2003 Server, Windows 2000 . |
| Max. telegram size | : | Up to 512 bytes pr. Telegram depending of capacity of AJ71C24 or compatible module. |
| Transmission speed | : | Up to 115Kbaud depending on the AJ71C24 (or compatible module) port speed. |
| Throughput | : | Up til 4 telegrams pr. Channel pr. Second (depending on available bandwidth). |
| Max. number of channels | : | Up to 8 COM ports are supported concurrently. |
| Max. number of nodes | : | 32 pr. COM port |
| PC hardware requirements | : | 1-8 standard serial ports (COM ports). Standard modem(s) if dialled-up is used. |
| PC software requirements | : | None |