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BMS bus structure Hardware characteristics • Connection half duplex• Communication master/slave • Nodes < 32 • Cable length < 1200 m• Recommended cable (shielded, shield on one side connected to PE) J-Y(ST)Y 2 x 0.6• Terminating resistor 120 Ω (0.25 W) 1, 5 - The first and last bus node always requires a terminating resistor of 120 Ω. 2 - Connect the bus cable on one side to earth JY(ST)Y 2 x 0.6. When the cable has been separated, the shield has to be bridged.3 - Technical data – BMS bus • interface parameters• Transmission 1 start bit, 7 data bits, 1 parity bit, 1 stop bit • Baud rate 9600 baud• Parity even• Checksum/sum of all bytes transmitted 0 (without CR and LF) • Data transmission with ASCII characters, yet not all characters are permitted. Only one master may exist on each BMS bus (setting via menu). 4, 6 - Address setting should be sequentially 1, 2, 3 … "without gaps".6 - Maximum number of addresses respectively nodes 32(repeater DI-1 not included).7 - If the cable length exceeds 1200 m, a DI-1 repeater must be used.8 - LAN cable between FTC470XET and the personal computer:a standard cable in case of direct connection, a cross over cable in case of router connection. 2. PROFIBUS 4. Ethernet/TCP/IP PROFIBUS is a fast, open bus system widely known in the field of automation. It is internationally standardized (IEC 61158 and EN50170) and is available in three variants:• PROFIBUS FMS (fieldbus Message Specification)• PROFIBUS PA (process automation) • PROFIBUS DP (Decentral Periphery)The protocol professional converter FTC470XDP supports the PROFIBUS DP. Here, central control devices (e.g. programmable controllers) communicate with decentralized input and output modules via a fast serial connection. BMS bus devices are connected with the PROFIBUS DP via the FTC470XDP. For control purposes a PROFIBUS MASTER is required. The ethernet is a widely used vendor-independent technology enabling data transfer of 10, 100 or 1000 millions bits per second (Mbps) in the Lokal Area Network (LAN). The ethernet belongs to the classic systems among the bus systems and has established itself as a standard in the IT world. With the FTC470XET protocol converter, BENDER provides the solution for this application. A complete web server integrated in the protocol converter allows easy operation and control of BENDER systems by means of a standard browser via any personal computer. The integrated OPC server allows data to be transferred to building management systems or to visualization software. 5. OPC The OPC (OLE for process control) is a standardized software technology. OPC is a standardized software in the field of auto-mation technology and is based on Microsoft COM and DCOM technology. It allows different programs of different manufactu- rers to communicate with each other. OPC is not a protocol, but a client/server application. It does not replace field buses. The OPC makes data available which can be accessed by OPC clients. The OPC server of the FTC470XET and the BENDER OPC server sup- ports the specification DA (Data Access) 1.0 and 2.0.Two OPC servers are available: • integrated in the protocol converter /web server FTC470XET• software solution for personal computers as BMS OPC server Technical aspects affecting the use of BENDER communication solutions 3. Jbus/Modbus Jbus/Modbus is an open, serial communication protocol based on the Master/Slave principle. Easy to be implemented to any serial interface, it has become very popular. The Modbus protocol initially has been developed for networking control systems but is now often used for the connection of input and output mo-dules. Owing to the low transmission rate of maximum 57.6 kbaud, the Modbus is specifically designed for systems with limi- ted bus nodes or for time-critical applications. The protocol con- verter FTC470XMB is designed for the connection of BMS devices to Modbus RTU. A Modbus master is required for the control of an FTC470XMB.
Annex 1.9.3 Main catalogue part 1 – 08.2007/Insulation monitoring 191