Description
The Mitsubishi AJ71UC24 computer interface modules allow external intelligent devices, such as computers, to communicate with the PLC CPU. Sequence programs, bit devices, word devices, parameters etc. can be monitored or written to using serial communications which conform to RS232C and RS422 standards. Multi-drop systems can be configured using these modules for linking up to 32 PLC stations and allowing access to all 32 from one centralised point. Each module can operate in either one of four fixed protocol communications or in no protocol mode. Each has its own built-in buffer memory for the reading and writing of data. For more technical information, please see the AJ71UC24 specifications table.
AJ71UC24 Technical Specifications
| Part number | AJ71UC24 |
| Applicable A Series PLC | AnU, AnA and AnN Series |
| Interface | 1 x RS232C channel, 1 x RS422 channel |
| Transmission system | Half duplex communication system, dedicated protocol |
| Synchronisation method | Asynchronous |
| Transmission speed | 300, 600, 1200, 2400, 4800, 9600, 19200bps (switch selectable) |
| Data format | 1 start bit, 7 or 8 data bits, 1 or none parity bit, 1 or 2 stop bit (switch selectable) |
| Access cycle | Made at END of sequence program. Access time is equal to scan time |
| Error detections | Parity check present odd/even or absent, sum check present or absent |
| ER/DR control | Present |
| DC1/DC3 | Absent |
| Transmission distance | Up to 15m for RS232C, up to 500m for RS422 |
| Transmission code | ASCII |
| I/O points required | 32 points |
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