Send page remark Contact responsible person. Description and recommended values for the Protocol parameters: Any DF1 master implementation that uses the above blocks should also be able to read and write from the RMC Sets the maximum number of ENQ. The ItemID configurator tells the driver how to receive or send the item value. The PLCs of the lower series Micrologix do not support real numbers, but for example the Micrologix can use the real numbers. The Half-duplex mode is used for the special connection of more Slave device stations to one PC.

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Protocol data type Only for Ethernet.

Does your device use the Rockwell DF1 protocol?

The driver uses optimalised internal communication messages for reading the data from the device. With the freeware alln PmFreeor when developing the application with development environment for tersting purposesthis component is always functional.

ItemId is the text identifier of the item that is used for addressing the value in the device. Specifies the protocol data form. Otherwise, any line driver can be used.

Only for serial link. This type is currently not functional for PmCommData object.

There can be multiple areas of this type in the PLC and the first is always numbered 8. It is possible to set: Both full- and half-duplex DF1 use the same application protocol, which consists of commands and functions for the slave or peer to execute.


DF1 (Full- and Half-Duplex)

The match of the Test string qualifies the right result in sending and receiving. The Full-duplex mode is used for the connection of the point-to-point type i. There can be multiple areas of this type in the PLC and the first is always numbered 6.

It is used for testing the communication. Allen-Bradley DF1 is typically used for higher-speed data monitoring where frequent data updates are required. The text can be written manually, or it can be assembled in the window opened by the button to the right of the configurator.

Otherwise we recommend not to enter any “Sub-Element number” value, or enter 0. For common data transfers, it is easier to use the PmCommData object.

Allen-Bradley PLC – Arduino – Allen-Bradley DF1 Protocol

When writing to the variable, only the single value is sent if the Auto send when writing to item configurator is checked.

Description and recommended values for the Protocol parameters: If no response comes during this time, then the transfer of the message is terminated onEndOfTransfer event fires with error 24 or It can be a value from 0 to The PLC is often preset to address 0.

Only for L – Long data area. The variables in the PmCommData object or even better the variables in the PmData object with ExtComm data extension can be of arbitrary number, type and order.


Macro expression can be used for input it is evaluated while the application is launching. Setting all counters and timers to 0.

All variables are read if the Data refresh enabled configurator is checked. For easy integration of this driver into the application it is handy to use: The Allen-Bradley DF1 works to ensure that you are delivered information nearly instantaneously, as most units typically do not have archiving history capability in its hardware.

DF1 Protocol (Full- and Half-Duplex)

The size of the written data shouldn’t exceed bytes. Remote roating – Communication via bridge. There is only one such area in the PLC and is always numbered 2.

There can be multiple areas of this type in the PLC and the first is always numbered 4. With our leading products and equipment your protocol will be able to transmit and receive data from all other SCADA devices. Companies will reap the benefits the Allen-Bradley DF1 offers while saving costs associated with having to update an entire SCADA system to devices that speak the protocol.