SERCOS II Interface printer friendly P872 Servo drives from a wide variety of SERCOS compatible manufacturers can be connected via the fibre-optic ring. The Motion Coordinator software allows for configuration of the servo drives, reading and writing drive parameters, and running cyclically in speed or position modes. Each module is configured with 2 servo axes. Additional axes can be enabled using “Feature Enable Codes". Baud rate and light intensity are software configurable, and standard drive profiles can be selected through Motion Perfect. Specification Network SERCOS Network Speed 4, 8 or 16Mbps Topology Ring Max Slaves per Interface Ring 16 Max Interfaces per MC464 7 Max Axes per MC464 64 Cable Fibre-optic Bus to MC464 32 Bit Interpolated time based registration 8 x 24V inputs Remote registration Y Optically Isolated registration Inputs Y Map Any I/O to Any Axis Y Features Based on Sercon 816 ASIC Maximum of 250uS update rate 4, 8, 16 MBit/S network speed 9mm FSMA Connector Ring Topology 4 LED Status indicators including RING STATUS Each module has 8 registration inputs with 100nsec resolution Choice of Drive based or Master based registration Back to MC464 main page What is SERCOS? SERCOS is an efficient and deterministic communication protocol aimed at high speed digital motion control. It enables industrial equipment from different manufacturers to be precisely synchronized and exchange information at very high speeds. SERCOS is an open standard, enabling multi-vendor motion controllers, intelligent drives, IO, sensors and actuators to communicate over a single noise-immune fibre optic or ethernet ring. It exchanges closed loop control and feedback data at high speed and with very short cycle times. In addition, the standard also defines a service channel for non-cyclic data exchange – such as progress, status, and diagnostics. The architecture has been designed to greatly simplify installation, diagnostics, and commissioning, hence reducing both the time and costs of machine delivery. Advantages of SERCOS? SERCOS is an efficient and deterministic communication protocol aimed at high speed digital motion control. It enables industrial equipment from different manufacturers to be precisely synchronized and exchange information at very high speeds. SERCOS is an open standard, enabling multi-vendor motion controllers, intelligent drives, IO, sensors and actuators to communicate over a single noise-immune fibre optic or ethernet ring. It exchanges closed loop control and feedback data at high speed and with very short cycle times. In addition, the standard also defines a service channel for non-cyclic data exchange – such as progress, status, and diagnostics. The architecture has been designed to greatly simplify installation, diagnostics, and commissioning, hence reducing both the time and costs of machine delivery. Trio's SERCOS technology support Fast and capable – upto 64 axes of control ! The Trio SERCOS module sends 32 bit control values and receives 32 bit feedback values, at speeds of up to 16MHz and with a cycle period as fast as 250usec. With up to 16 axes per SERCOS expansion module, and 4 modules per motion co-ordinator, you have the possibility of 64 axes in total. The motion on all these axes being synchronised by the motion co-ordinator. Precise Synchronization Hardware synchronization ensures precise and reliable timing of the communication messages. The standard enables precise synchronization, with jitter (fluctuation in accuracy) of the messages of less than a microsecond. Before commencing normal operations, each drive is given a time within the cycle period at which it must transmit its information, preventing any message collisions on the bus. Ease of Use You can achieve 'plug and play' ease of installation and commissioning using SERCOS with the help of Trio. The use of the single fibre optic ring simplifies installation, and Motion Perfect's intelligent drive wizard assists commissioning. Motion Perfect will search the ring to discover the drives, configure various parameters on the drive, and create your TrioBASIC startup program. Each time the coordinator and drives are powered on, running this startup program will initialise the ring and raise the drives into their normal operation mode. We have added keywords to the TrioBASIC language to simplify access to the SERCOS drives, providing easy access the drives internal parameters, and easy control of the ring. Flexible A range of data transmission rates and cycle times can be defined. The number of axes on a ring can be from between 1 to 16, and with up to 4 rings controlled by one motion coordinator you have the opportunity of precise, synchronized control of up to 64 axes ! The drives can be located some 50 metres apart using plastic fibre cables, or upto 250 metres using glass fibre cables. The drives can be configured in position or velocity control modes, and access to all the standard SERCOS and the drives own manufacturer specific parameters is possible via the service channel. Standardized Communications A standard service channel communication method provides access to a range of parameters on all devices on the ring. Trio's motion coordinator can access all the drives on the ring, updating their internal parameters in order to configure them for different applications, monitoring status and diagnostic information, or even saving existing configurations. Rapid Machine Design and Development The use of SERCOS greatly reduces machine design time. It solves connectivity problems between equipment from different manufacturers, and the use of a fibre optic ring removes the need for complex wiring. Reduce Commissioning Costs The reduced wiring speeds installation time and reduces costs. Application development is simplified, with Motion Perfect automatically creating the ring startup program. The master can access a whole host of parameters on any device on the ring, to configure the device, check status, and help identify and resolve any problems encountered. Reduce Cost of Ownership SERCOS enables Trio's motion co-ordinator to request drive status information every servo cycle. By monitoring this status information, the motion co-ordinator can determine when materials need to be changed, or when preventative maintenance is required. Additionally, should a problem arise the motion co-ordinator can interrogate a range of standard and drive specific parameters to assist in the diagnosis of the problem, and provide information to the operator about how the it should be resolved. Should a drive need to be replaced, the maintenance engineer has only to set the appropriate drive address (usually via rotary or dip switches on the drive), and run the TrioBASIC startup program to re-commence normal machine operation. Safe and Reliable The use of fibre optic or ethernet cabling provides high immunity against electromagnetic interference. The motion co-ordinator and the drives verify and validate all messages received. Errors are identified whether they have arisen at the data transmission or higher application levels. The SERCOS hardware checks all messages to identify any message corruption, causing re-transmits if the problem occurs on the service channel or stopping the drives if an error occurs with the cyclic command information. The SERCOS specification enables the user to define maximum permitted following errors and velocity deviations. The drive will check the demand setpoints are within the expected range, and reject any which would cause an excessive velocity or movement. If the drive does encounter a communication or motion error, it will stop, log the error and inform the motion co-ordinator of the problem. Designed Motion Fieldbus Unlike many other fieldbus protocols which have been adapted to support motion control, SERCOS was designed from the outset as a hard real time, deterministic high speed industrial motion control protocol. It has proven to be the ideal technology for demanding applications requiring high speed dynamics and precise control. Proven technology The SERCOS user group was founded in 1990, The SERCOS specification was first released in 1991, and became an international open standard in November 1995 (IEC 61491). Trio has supplied SERCOS master and slave products since XXXX. Since it was first introduced over 350,000 different applications have been successfully completed using this technology, in virtually all automation and machining markets – including packaging, textiles and printing machines. There are now over 2 million SERCOS real-time nodes in operation. Future Proof Open Standard SERCOS is an open internationally published standard, owned by its user organisation. It is continuously being developed by non-proprietary experts in working groups, to ensure it remains up to date, and adapting to new market requirements How to' setup SERCOS with Trio's MC464 Commissioning Installation is simple – plug in the SERCOS module to the motion coordinator. Connect the motion coordinator to the drives using fibre optic cables between each to create a ring, set the node address and baud rate on each drive (usually via external rotary or dip switches), and power-on these units. Connect your PC to the motion coordinator via ethernet, and run Motion Perfect. Open the intelligent drive wizard, and use it to ensure the ring has been successfully closed, to identify the drives, and create the TrioBASIC startup program. Either the wizard, or excecuting the startup program will initialise the drives, invoking their normal operation mode. Once the ring is in normal operations, the drives are controlled as always using the axis parameters and TrioBASIC language motion keywords - it is transparent to the user whether the axes are controlled via traditional analogue wiring or a digital fieldbus. Operation The motion coordinator exchanges data with the SERCOS module via the high speed 32bit data bus, and the module transmits the commands out on the ring and receives the drive feedback values. Registration is available via an external connector on the SERCOS module, alternatively most slave drives can be configured to latch a position value themselves which is transferred cyclically to the motion coordinator. The motion coordinator can operate the slave drives in either speed or position control mode, with position feedback. In certain applications where you want the ability to enable and disable sub-set groups of axes ( and not all the axes on the machine at one time ) this greater level of control is provided by a TrioBASIC language feature available for SERCOS systems. The use of the ENABLE/DISABLE_GROUP TrioBASIC keyword provides this finer level of control as it enables groups of axes to be organised together, and enabled or disabled as a group. Hence a particular group of axes will all be stopped when any one of them encounters an error, but all other axes in the system can continue operation as required. This feature must be used with great care ! Solving your problems and supporting your needs ! Trio's SERCOS support has been designed from the ground up to uniquely fulfil the needs of your customers, and to meet all their automation control requirements ! Using SERCOS will enable you to answer those questions, and resolve those issues which occur time after time as you put forward your proposal, win the contract and deliver upon your promises !