Toshiba T2 Series - Manuals

Page v Contents Important Information................................................................................................................ ii Safety Precautions................................................................................................................... iii About Thi...

Page 1 1. Overview The Modbus module (ML11) is used to connect T2E, T2N, or EX100 PLCs to a Modbus Master. The addition of the EX10-MML11 (MODBUS Module) allows the T2E, T2N or EX100 PLC to communicate via standard MODBUS RTU protocol. This allows quick and easy access to the PLC registers by a stan...

Page 2 2. System Configuration From 1 to 32 T2E or T2N PLCs can be connected to a Modbus master using the Modbus module. 1 to 1 Configuration T2 Minimum Configuration T2E PLC RS485 Power Supply T2E CPU Modbus Module I/O Modules Modbus Master 1. Higher Level PLC 2. Distributed Control System 3. Compu...

Page 3 1 to N Configuration Modbus Master 1. Higher Level PLC 2. Distributed Control System 3. Computer with SCADA or HMI Program RS485 T2 Maximum Configuration 1 Main Unit 3 Exp. Units Up to 32 Stations For high-speed data transfer, one of Toshiba’s Tosline Data Highway modules is recommended.

Page 6 5. Modbus Module Operation 5.1. Modbus Commands When a MODBUS command is used, the Modbus module translates it to the corresponding T2 register access protocol. MODBUS FUNCTION CODE T2 COMMAND 01 Read Coil Status DR Read Device/Register 02 Read Input Status DR Read Device/Register 03 Read Hol...

Page 7 5.2. Modbus Data Types and T2 Register Mapping This table shows how the different Modbus data types are mapped into T2 registers. In other words, a Modbus master would reference the following Modbus register ranges to access the corresponding T2 PLC registers. For example, Modbus Holding Regi...

Page 8 Modbus – T2 Address mapping Example: Modbus Address T2 Address T2 Data Type 30000 XW000 Input Register 40001 YW001 Output Register 44352 D0000 Data Register Note: When dealing with I/O registers, make sure that the Modbus master is attempting to access only the I/O points that physically exis...

Page 9 6. Modbus Module Setup The Toshiba Modbus module has been used reliably as a Modbus slave for several years. First it was used on Toshiba’s EX100 Series PLCs and now on the T2 Series PLCs. Before it can function as intended however, all the DIP switches must be properly set and all wiring con...

Page 11 Parity Check: Select the parity check as odd, even or none. Use switches 7 and 8 to set the parity. PARITY PEN (7) EVN (8) NONE OFF ---- ODD ON OFF EVEN ON ON ASY and DLY switches: The ASY and DLY switches are not used on the EX10-MML11, and should be set to the “Off” position.

Page 14 6.2. Wiring Connection to the Modbus Module Sometimes it is necessary to convert from the standard RS485 to RS232 for connection to a Personal Computer. The wiring between the Modbus module and the converter must be set as follows: RS485 Converter Modbus Module TXA RXA RXA TXA TXB RXB RXB TX...

Page 15 7. CPU Setup for the Modbus Module Two lines of ladder logic are necessary to configure a T2 CPU for use with the Modbus module. 1 Communications Priority: To insure uninterrupted communications between the CPU and the Modbus module, the communications priority bit S0158 must be set ON. 2. I...

Page 16 8. Trouble Shooting The communication status LEDs can be used to verify correct operation of the Modbus module. During normal operation, the LED indicators flash as follows: • RXD LED : Flashes when the Modbus master sends a message to the EX10 -MML11. On a multi slave network, this can also...

Page 17 9. Additional References Toshiba Corporation, Instruction Manual - EC300 Series Controller – ECBUS Transmission Interface Module – ML11 . 6F8A0613 4 th ed. Feb 1995. Tokyo, Japan. Toshiba Corporation, Computer Link Function Operation Manual . UM-TS03-E008, 3 rd ed. Aug. 1977. Tokyo, Japan. G...

Page 2 TOSHIBA TOSHIBA INTERNATIONAL (EUROPE) LTD. 1 Roundwood Avenue Stockley Park, Uxbridge Middlesex UB11 1AR, UNITED KINGDOM Tel: 081 848 4466 Fax: 081 848 4969 E_mail [email protected] TOSHIBA INTERNATIONAL CORPORATION PTY. LTD . Unit 1, 9 Orion Road Lane Cove N.S.W. 2066, AUSTRALIA Tel: 02...