The Epsilon Ei DeviceNet Drive is a low-level network device designed for industrial automation applications, specifically for connecting simple industrial devices like sensors and actuators to higher-level industrial PLCs. It functions as a Group 2 Server or Group 2 Only Server slave on a DeviceNet network.
Function Description:
The Epsilon Ei DeviceNet Drive facilitates communication within a DeviceNet network through two primary methods: Polled I/O connections (Implicit Messaging) and Explicit Messaging connections.
- Polled I/O Connections (Implicit Messaging): This method involves the Master transmitting Poll Commands to specific Slaves (point-to-point) to gather and distribute I/O data. The Slave then returns I/O data to the Master when polled. Polled messages are used for high-priority data, such as index initiates or position feedback, and can be read by the PLC on every scan. The drive supports 8 predefined assembly blocks for polled data transfer (8 bytes input, 8 bytes output).
- Explicit Messaging: These messages are initiated from a user-created program within a PLC or PC-based software. They allow access to all user-accessible parameters within the Ei-DN drive, enabling the transfer of recipes or any 32-bit parameters. Explicit messages have lower priority than polled I/O messages and may take multiple PLC scans.
The drive's DeviceNet interface can be configured using PowerTools FM software. This software allows users to set up MacID, Baud Rate, select predefined assembly blocks, and enable host mode. It also displays fixed assembly block word mapping.
Important Technical Specifications:
- DeviceNet Communications Link:
- Configuration: Trunk-line/drop-line.
- Node Support: Up to 64 nodes.
- Node Removal: Supports node removal without severing the network.
- Power: Simultaneously supports network-powered (sensors) and self-powered (actuators) devices. High current capability (up to 16 amps per supply).
- Connectors: Uses sealed or open-style connectors.
- Wiring: Protection from wiring errors.
- Data Rates: Selectable baud rates of 125k, 250k, and 500k baud.
- Power Supplies: Operates with off-the-shelf power supplies.
- Power Taps: Allows connection of several power supplies from multiple vendors compliant with DeviceNet standards.
- Overload Protection: Built-in.
- Bus Power: Both signal and power lines are contained within the trunk line.
- Hardware Components:
- Cables: Thick and thin cables are supported. Thick cable consists of two shielded pairs twisted on a common axis with a drain line, covered with an overall braid. Thin cable is smaller and more flexible, used for shorter distances as drop lines.
- Connectors: DeviceNet connectors can be either open-style (wires exposed) or sealed.
- Power Supply Requirements: A separate 24 VDC power supply is needed for the DeviceNet network. The Ei-DN slave interface is powered using "network power." Devices may take all of their required power off the network per ODVA specifications. The Ei-DN draws 25 mAmps from the DeviceNet power supply. The power supply must have its own current limit protection. Fuse protection must be provided for each segment of the cable system. Power supplies should be distributed throughout the DeviceNet network to maintain a maximum of 4 Amps per trunk branch.
- Terminating Resistors: Required to reduce reflection of signals over the network. Each terminator must be 121 ohms and installed on both ends of the network between CAN_L (pin 2) and CAN_H (pin 3).
- DeviceNet Parameters (Modbus Addresses):
- DN Allocation Choice (Connections Established): 34003 (WORD, RO).
- DN Allocation Master MacID: 34004 (UINT, RO).
- DN Baud Rate: 44002 (WORD, RW) – values 0=125K, 1=250K, 2=500K.
- DN Bus Off Counter: 34206 (UINT, RO).
- DN Bus Off Fault Count: 40719 (UINT, RO).
- DN Bus Off Interrupt: 34205 (WORD, RO).
- DN Comm Time-out Fault Count: 40717 (UINT, RO).
- DN Device Type: 34002 (UINT, RO).
- DN Duplicate MacID Fault Count: 40718 (UINT, RO).
- DN FAB Master Receive Block: 34011-34014 (US16, RO).
- DN FAB Master Send Block: 34007-34010 (US16, RO).
- DN Host Mode: 44003 (WORD, RW).
- DN MacID: 44001 (UINT, RW) – range 0-63.
- DN Master Receive Bitmap: 34006 (UINT, RO).
- DN Master Receive FAB Type: 44005 (WORD, RW).
- DN Master Send Bitmap: 34005 (UINT, RO).
- DN Master Send FAB Type: 44004 (WORD, RW).
- DN Module Status: 34208 (WORD, RO).
- DN Network Status: 34207 (WORD, RO).
- DN Receive Counter: 34203-34204 (UDINT, RO).
- DN Status Major Recoverable Fault: 14003 (BOOL, RO).
- DN Status Major Unrecoverable Fault: 14004 (BOOL, RO).
- DN Status Minor Recoverable Fault: 14001 (BOOL, RO).
- DN Status Minor Unrecoverable Fault: 14002 (BOOL, RO).
- DN Transmit Counter: 34201-34202 (UDINT, RO).
- DN Vendor ID: 34001 (UINT, RO).
Usage Features:
- PowerTools FM Software: The Epsilon Ei-DN configuration is easily set within PowerTools FM software. Users can select between 8 predefined assembly blocks for polled data transfer (8 bytes input, 8 bytes output). The software also allows the master to set up an explicit messaging connection to access all user-accessible parameters.
- Host Mode: Enabling "Host Mode" gives the host (DeviceNet Master) exclusive control over input functions such as Index Select, Index Initiate, Jog +, Jog -, Jog Fast, Home Initiate, Define Home, and Brake Control and Release. Other functions are logically OR'ed with inputs and Modbus 3 in Host mode. This feature is useful for switching hardwire I/O access between "DeviceNet only" and "DeviceNet I/O or Hardware I/O."
- One-Touch Configuration: The Baud Rate and MacID can be easily changed externally on the drive using a one-touch setup with the "Reset" button. This allows for viewing and changing the high and low digits of the MacID and selecting standard baud rates (125K, 250K, 500K).
- Input and Output Tabs: DeviceNet bits are user-defined and assigned within the inputs and outputs tabs. These bits are used with specific assembly blocks for data transfer via polled connections. Multiple assignments can be made to the same DN bit, and the same I/O function can be mapped to a DN bit and an I/O assignment, allowing simultaneous indication of drive status to multiple devices via hardwire and DeviceNet.
- EDS File: The EDS file is used for configuring the DeviceNet master, providing information on I/O data support, vendor code, and module revision. It also contains Class, Instance, and Attribute IDs for all Ei drive parameters, which are used for explicit messaging.
Maintenance Features:
- Safety Considerations: The product is intended for professional incorporation into a complete system. Incorrect installation may present safety hazards due to high voltages, currents, stored electrical energy, or control of mechanical equipment. Electrical installation, system design, commissioning, and maintenance must be carried out by trained and experienced personnel.
- Enclosure: The product must be mounted in an enclosure that prevents access by unauthorized personnel and contamination. It is designed for use in environments classified as pollution degree 2 (dry, non-conducting contamination).
- Setup, Commissioning, and Maintenance Precautions: Careful consideration is required for changes to drive settings, as they can impact safety. Appropriate precautions must be taken against inadvertent changes or tampering. Restoring default parameters may cause unpredictable or hazardous operation in certain applications.
- Safety of Machinery: The product is designed and tested to a high standard. However, the level of integrity offered by the product's control functions (e.g., stopping, forward/reverse, and maximum speed) is not sufficient for safety-critical applications without additional independent channels of protection. All applications must be subject to a risk assessment, and further protection may be needed.
- AC Supply Isolation Device: An approved isolation device must be used to disconnect the drive from the AC supply. This device must be capable of being locked in the OFF position.
- Grounding (Earthing, equipotential bonding): The drive must be adequately earthed to carry all possible fault current in the event of a fault.
- Fuses: Fuse or over-current protection must be provided at the input in accordance with the instructions in the manual.
- Isolation of Control Circuits: The installer must ensure that external control circuits are isolated from human contact by at least one layer of insulation rated for use at the applied AC supply voltage.
- Faults and Diagnostic Display: PowerTools FM provides an extended set of fault and diagnostic parameters for setup and monitoring of the DeviceNet Network.
- Module Status LED: Located on the front of the drive, this LED indicates whether the device is in standby or operational mode, with different states (Off, Green, Flashing Green, Flashing Red, Red, Flashing Red-Green) indicating conditions like no power, operational, standby (needs commissioning), minor fault, unrecoverable fault, or self-testing.
- Network Status LED: This virtual LED indicates proper communication with the DeviceNet network, with states (Off, Flashing Green, Green, Flashing Red, Red) showing conditions like not online, online but not connected, link OK and connected, connection time-out, or critical link failure.
- Counters: The DeviceNet Online Tab displays Transmit/Receive Counters (successful data packet exchanges) and a Bus-Off Counter (number of bus failures), which are useful for troubleshooting wiring errors, baud rate settings, or MacID errors. Ten consecutive bus-offs initiate a bus-off interrupt (major fault).
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