Man Al2000_eng.pdf - FF-Automation

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AL 2000 User Guide Page 4 - 1 06/05/00 4. DISTRIBUTED CONTROL SYSTEM All CPU modules are capable of controlling AL2000 remote units in addition to the basic unit (each having a maximum of 32 I/O modules). Each remote unit may consist of one basic mounting rack and one expansion mounting rack. The MODBUS RTU protocol is also supported all CPU modules, enabling the AL2000 to be connected to other PLCs and computers via serial interface. Using MODBUS remote units a fully distributed control system can be realised. Basic Unit Expansion Unit Remote Unit Keypad/Display Unit Modbus or I 2 C DIS1 LED1 LED2 LED3 LED4 LED5 LED6 LED7 LED8 Modbus RS-485 300-115200 bit/s Remote Unit 0 1 2 3 4 5 6 7 8 9 A B C D E F Keypad/Display Unit Modbus or I 2 C DIS1 LED1 LED2 LED3 LED4 LED5 LED6 LED7 LED8 Remote Unit 0 1 2 3 4 5 6 7 8 9 A B C D E F FF-Automation Oy
Page 4 - 2 06/05/00 AL 2000 User Guide 4.1 The MODBUS RTU Protocol Using the MODBUS RTU protocol, the AL2000 can be connected to other PLCs (AL2000, AL100, AL20AN, AL32, AL16, AL14) and/or a computer via serial interface. The AL2000 can function as MODBUS Master or MODBUS Slave to other units. Several MODBUS masters can be used in the same AL2000 system. One AL2000 can operate as a master to another AL2000, which in turn can operate as master to a third AL2000. This allows large distributed control systems to be realised. Using MODBUS to connect the AL2000 to a computer running software such as PARAGON, opens up unlimited opportunities for SCADA (Supervisory, Control And Data Acquisition) applications. 4.1.1 Error Checking All MODBUS communication is subject to the following error checks by both Master and Slave units: - CRC16 Checksum - Command Validity Check - Address Validity Check - Message Length Check - Framing Check - Message Integrity Check Messages may be transmitted at rates of 300-115kbaud. The composition of the message frames is shown below: SLAVE ADDRESS FUNC- TION MEMORY ADDRESS DA- TA CRC16 CHECK- SUM START (1 bit) DATA ( 8 bits) STOP (2 bits) Modbus messages are launched from master either based on pollrate defined in the message or if user has defined conditional messages, these are launched from PLCprogram with FCN instruction. The Slave unit ignores all invalid messages. If, after transmitting a message, the Master does not receive a valid response from a slave, it will time-out after 500 ms and re-send the message. If the Master still does not receive a valid response, it will ignore all further messages destined for that slave for 10 seconds. On the next run through the message list the Master will attempt to send messages to that slave again. The PC's MODBUS COM port may be initialised from DOS using: MODE COM1 9600,8,2,N,P FF-Automation Oy
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