1. Communication

2. COMMUNICATION Voice Language Between people

3. COMMUNICATION Between machines Physical Layer Communication Protocols

4. Physical layer Unitronics PLCs support several physical layers: RS232 (2 units; up to 16 meters) RS485 (up to 32 units; up to 1200 meters – “daisy chain”) CANbus (up to 64 units; up to 1000 meters – “ daisy chain ” ) Ethernet (up to 100 meters from device to HUB – “Star”( General Review

5. Protocols Unitronics PLCs support several Protocols: Pcom (Unitronics private protocol) MODBUS CANbus (Unitronics ISC, UniCAN, CANOpen) MODBUS IP Option to implement third party protocols (RS232/485 and Ethernet) General Review

6. Hardware Review None Some models 1 port, RS232 M90 Ethernet card (optional) None Ethernet All models Some models Some models CANbus 2 ports, RS232 1 optional port, RS232/485 2 ports, RS232/485 1 port, RS232/485 Serial V230/260/280/290V120M91/91-2 Jazz (option) V570 2 isolated ports, RS232/485 Yes Ethernet card (optional)

7. Protocol Review V230/260/280/290 /V570 V120M91/91-2M90 Pcom MODBUS User defined Pcom MODBUS User defined Pcom MODBUS User defined PcomRS232 RS485 ISC UniCAN CANOpen ISC UniCAN CANOpen ISC CANbus Pcom over IP MODBUS IP User defined None Ethernet

8. Physical Layers RS232 Communication parameters 300 ~ 115200 bps Baud rate: 300 ~ 115200 bps always 1bit Start bit: always 1bit 7 or 8 data bits Data bits: 7 or 8 data bits Even, Odd, None – 1 bit Parity check: Even, Odd, None – 1 bit 1, 1.5 or 2 bits Stop bits: 1, 1.5 or 2 bits only1011 Communication “word” can be only 10 or 11 bits Allbothmust be exactly the same! All communication parameters in both sides must be exactly the same! M90/91 & Jazz default parameters: 9600, 7, Even, 1 Vision default parameters: 57600/115200, 8, None, 1

9. Physical Layers RS485 Communication in “daisy chain” network – up to 32 devices Balanced half duplex signal (RS485) ABTwo wires A (Rx/Tx+) and B (Rx/Tx-); Up to 1200 meters - twisted shielded pair cable; Supported by Jazz (optional) M91-2-xx, V120, V2xx (optional) controllers, V570

10. Physical Layers RS485 Communication parameters – same as in RS232 Addressing (Unitronics OPLC) – ID 65 ~ 254

11. Protocol Review The Pcom Protocol All Unitronics PLC operating systems are embedded with the Pcom protocol. Pcom enables Unitronics PLCs as slave devices, enabling them to be accessed by incoming communications via all ports. The Pcom protocol is also the protocol that we use for programming, remote access, and data acquisition The Pcom protocol is addressable by nature (part of the protocol) and so it can work over a network as well. The Pcom protocol is given free as a DLL with all documentation and help for people to implement inside their software.

12. Protocol review The Pcom protocol Two other implementations of the Pcom protocol are the DDEserver and the OPCserver. DDEserver and OPCserver are PC based applications that can, on one hand, take information from our PLCs and on the other give out this information in a format that other Windows based applications can understand (like SCADA systems for example). Our DDE and OPC server are given free on the installation CD of both U90Ladder and VisiLogic, or can be downloaded from our website.

13. Protocol Review The MODBUS protocol One of the most common protocols in the market is the MODBUS protocol. The MODBUS protocol, originally made for Modicon PLCs, is shared by many SCADA applications, drives and other equipment. In order to support MODBUS, the PLC has to conform with the MODBUS addressing structure. MODBUS is a master-slave protocol, and can run over RS232/485 as well as Ethernet. There are different versions of Modbus. We support Modbus RTU (binary) over RS232/485 and Modbus IP over Ethernet

14. What do you think? Let’s make a small application that implements MODBUS communication between two PLCs. One PLC will act as master PLC, and the second will act as slave.

15. Physical Layers CANbus Unitronics’ CANbus runs on the same physical layer as A.B.’s DeviceNet, but uses a different protocols. A CANbus network can include up to 63 PLCs and mix different models of M90/91as well as Vision.

16. CAN bus wiring Specifications

17. CAN bus Cable Lookout

18. Protocol Review CANbus as Bridge A PC can ‘talk’ to a Vision via the RS232 serial port. The PLC can act as a ‘bridge’ between RS232 and CANbus. Up to 63 PLCs can be connected in a CANbus net and then linked via the ‘bridge’ to a PC. The PC can ‘see’ each PLC in the CANbus net. The ‘bridge controller’ needs no special programming or hardware. Any random controller in the net can act as the bridge. This connection also allows software download and upload to every PLC on the net. In the case of a mixed network (M90/91 and Visions) the bridge controller must be a Vision PLC.

19. CAN bus Network to PC Unit ID 1 Bridge Unit ID 2Unit ID 3

20. Protocol Review Protocols over CANbus PLCs on the CANbus network can also ‘talk’ among themselves. In Unitronics protocols – ISC and UniCAN, the PLCs are both master and slave. ISC and UniCAN are Multimaster protocols CANOpen is protocol, supported by a lot of third party devices. It’s supported only by Vision series OPLC. Unitronics acts as Master. One Unitronics controller can be connected to few other devices.

21. Let’s build a small application that connects two PLCs in CANbus - UniCAN and allows them to read information from each other. What do you think?

22. Modem All Unitronics PLCs support modem connection. Connecting to the PLC from afar enables one to remotely download, debug and upload applications. Remote Communication

23. Unitronics PLCs support 4 types of modems: PSTN modem (Plain Simple Telephone Network) GSM/GPRS modem (wireless) CDMA modem RF modems Remote Communication Modem

24. When we want to connect a PC to a PLC via modem we have 3 aspects to look at: PLC to modem Modem to modem Modem to PC The cable connecting the PLC and modem is the Unitronics’ programming cable, accompanied by a special connector (each modem has its own). The modem has to be prepared, via software, before it is connected. The connection can be established both from the PC and the PLC Remote Communication Modem

25. SMS One of the major advantages of cellular modems is the ability to send short text messages (SMS). SMS is a global standard that allows the sending of characters from one phone to the another. The phones can either be on the same network or on different ones (depending on agreements between the cellular providers). Remote communication

26. The ability to connect the PLC to a cellular phone opens up a wide variety of applications. Basically, a PLC connected to a GSM modem can receive pre-programmed messages and act accordingly. The PLC can also respond by sending a message to a cellular phone. Remote Communication SMS

27. Another important part of Remote Access is the Remote Communication Ethernet

28.  Unitronics’ Vision230/260/280/290/570 all support Ethernet.  Our Ethernet Card offers 4 sockets and works with both TCP/IP and UDP/IP.  The Ethernet card can work with speeds of either 10 or 100Mbps.  The PLC supports the MODBUS over TCP protocol and uses this as the connection to SCADA systems and among PLCs. Remote Communication Ethernet

29. As part of Unitronics philosophy, we provide a special software utilities - free with our Software CDs. This utility enables PC to PLC modem connection and remote access—even without VisiLogic or U90Ladder software. Software Utilities Remote Communication

30. This easy to use tool is in fact a very simple “SCADA” It enables monitoring and operate of the controller from PC. Remote access supports RS232/485, Modems, Ethernet and CAN bus via “bridge”. Remote access Remote Communication

31. This tool is especially designed to make automated reading of Data Tables from Remote OPLC to PC. Supports RS232/485, modem connection and Ethernet. DataXport Remote Communication

32. Unitronics – Thank You Unitronics – Thank You

34. RS485 Wiring Specifications

35. CAN bus Cable Lookout

36. RS232/RS485 Port Pinout M91-19-4xx, the new M91-2-xx and Vision series controllers have common RS232/485 COM ports. RS232 or RS485 are jumper selectable.

37. In order to establish communication we need to deal with 4 elements: General Review Physical layer Protocol Baud rate Data structure

38. What's the maximum number of PCs that can ‘look’ simultaneously at one PLC? Let’s make a small application that communicates between two PLCs over the Ethernet. What do you think?

39. Unitronics PLCs support a wide range of baud rates: 9600-57600bps for serial communication 50-1000Kbps For CANbus 10/100Mbps for Ethernet Baud rate General Review

40. Unitronics PLCs support different structures: 10/11 for serial 11 bit format TCP or UPD for Ethernet Data structure General Review

41. Physical Layers RS232 Communication between two devices only Unbalanced full duplex signal Up to 16 meters Supported by all Unitronics controllers

42. Physical Layers RS232 Two types of communicating devices: DTE (Data Terminal Equipment) Computers Controllers DCE (Data Circuit-Terminated Equipment) Printers Modems Male DB9Female DB9

43. Physical Layers RS232 DTE signals and pin-out DCE signals and pin-out ComputerUnitronics OPLC

44. Can I centralize information from 9 PLCs on the CANbus network into one PLC? I have a sensor that runs on CANopen. Can I connect it to the CANbus network and read the value inside the PLC? What is the maximum number of PCs that can simultaneously look at the data within a Unitronics CANbus network? What do you think?

45. A modem, in general, has two modes of operation: Command mode Data mode In Data mode, the modem is a tube conveying data between two points. When we talk of modems in a network (like RF), we must ascertain that the modem does not add anything to the data; if it does, we must take it into consideration in the protocol. In order to enter data mode, the modem has to connect to the other modem (or the network), and at the end of the session it must disconnect. In Command mode, one can use the AT commands to communicate with the modem, change settings, or make the modem perform different operations. The modem stays in command mode until someone connects to it, or gives the dial command. Remote Communication Modem

46. What conditions have to be met in order to download an operating system over a modem? Can I use internal modems on the PC? What selections do I have to make in the PC modem configuration? Can I be connected, over modem, to more than one PLC at a time? What do you think?

47. I want to have a system that will call me every time there is an event, can I do that? What will happen when the system calls? If I want to connect to one of my PLCs for debugging, can SMS messages still flow in and out of the modem? Can an SMS be considered as a real-time event from the system? What do you think?