FIELDBUS APPENDIX - ANYBUS-S MODBUS PLUS DOC. NO ABS-MBP-1.31 2002-08-09

2.3Physical Interface

•Transmission media: Modbus Plus one differential line and shield.

•Topology: Token Bus Structure, virtual token ring.

•Fieldbus connectors: 9 pin female Dsub, Phoenix Contact plug-able connector or 2mm connector.

•Cable: Shielded copper cable, One Twisted pair.

•Isolation: The bus signals are separated from the other electronics with a transformer according to Modbus Plus interface description.

•ASIC's and circuits: Module is based on chip-set and software from Modicon Inc.

2.4Fieldbus data

•Baudrate : 1MBit

•I/O data size: Maximum 32 words input and 32 words output.

•Modbus Plus Host Firmware Rev. 77.

2.4.1 Global data and Point-to-point commands

Towards the application the configuration of the in and out areas is performed in accordance with the Any- Bus-S standard. If I/O data is used it will be first in the IN and OUT area.

•Max. Amount of Global data: 32 words.

•Max. Amount of Point-to-point data / message: 125 words (Read Holding Register).

2.5Data Exchange

•Compatibility with existing ANYBUS® modules: Only compatible with other AnyBus-S modules.

•The module supports Global Data Base Transaction