Specifications

Allen-Bradley DF1 Driver Help
Device Setup
Supported Devices
Micrologix Series*
SLC500 Series*
PLC-5 Series (excluding the PLC-5/250 and PLC-5/VME series)
RSLogix5000
*Radio Modem link protocol requires the following firmware upgrades:
SLC 5/03, SLC 5/04 and SLC 5/05: Series C FRN6
MicroLogix 1200: Series C FRN7
MicroLogix 1500: Series C FRN8
Device ID
The Device ID is the Allen-Bradley DF1 network address of the PLC. For PLCs on a DH-485 or DH+ network, the
range is 1-63. Otherwise, the range is 0-255.
For Full Duplex, the default address of 1 will work.
For Half-Duplex, the address must match the slave address.
For Radio Modem, the address must match the slave/peer address.
Ethernet Encapsulation
This driver supports Ethernet Encapsulation, which allows the driver to communicate with serial devices
attached to an Ethernet network using a terminal server. Ethernet Encapsulation mode may be invoked through
the COM ID dialog in Channel Properties. For more information, refer to the OPC Server's help documentation.
DH-485 and DH+ Support
An Allen Bradley KF3 or compatible device is needed to connect the driver to the DH-485 network. There are four
options for communicating to a device on DH+ using the Allen-Bradley DF1 Device Driver.
l Allen Bradley KF2 or compatible device.
l 1784-U2DHP USB converter. This converter appears as a new serial port to the system.
l DataLink DL Interface Cards (PCI/ISA/PC104). These cards add virtual serial ports for seamless
configuration.
l DataLink DL4500 Ethernet-to-DH+ Converter. Configure the device for Ethernet Encapsulation. NIC is
required.
See Also:
Cable Connections
Function File Options
SLC500 Slot Configuration
Communicating with RSLogix5000 Family Controllers
Modem Setup
This driver supports modem functionality. For more information, please refer to the topic "Modem Support" in the
OPC Server Help documentation.
Protocol Settings
Error Checking Method
There are two methods of error checking available in the Allen-Bradley DF1 driver: Block Check Character (BCC)
and 16 bit Cyclic Redundancy Check (CRC-16). Users must choose the checksum method expected by the device;
otherwise, the device will not respond.
Request Size
This parameter is used to change the size of a data request. It can be important in refining the application's
performance. If the application accesses large areas of PLC memory consecutively, then a large request size may
be beneficial. If the data is spread throughout the PLC, then a small request size may be beneficial. The default
setting is the large request size.
Swap PLC-5 Float Words?
PLC-5 Floats follow the IEEE 754 standard. They contain a sign bit S, an exponent E and a mantissa M. The 32 bit
layout of this IEEE 754 Float is as shown below.
www. kepware.com
10