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Release Notes
Ethernet/IP VIM v3.6.1 Release Notes
By Noelle Weymer
Product: IOD-4102 - Ethernet/IP Scanner Driver (Rockwell PLC Interface - Logix, PLC5, SLC505)

The following release notes are for the Ethernet/IP VIM v3.6.1

Product Description:

These release notes are for changes made to the Ethernet/IP VIM firmware for v3.6.1. The previous general released firmware version is v3.5.4. The flash procedure is documented in the product manual.

Who should upgrade?

This firmware release is RECOMMENDED for all Ethernet/IP VIM firmware v3.5.x users. It is MANDATORY for all Ethernet/IP VIM users at or prior to firmware v3.3.64.


1. Dataset scan request/response time has been improved significantly through optimization of Ethernet/IP stack message handling resources.

2. Two new Special Data 5 flags (highlighted in table below) have been added to support redundant communications to a ControlLogix PLC where one network connection is to an ENBT or EN2T card, while the second network connection is directly to the PLC CPU channel 0 port via an Ethernet/IP to Serial converter like the 1761-NET-ENI module. Respectively, where the first network connection requires a path specification, the second does not. The Special Data 5 flags inform the VIM regarding which connection is pathless. The flags are as follows. A bit set to 1 implies an asserted flag, and flag values may be added to assert more than one flag. Unspecified flags are reserved.

Special Data 5 Bit # Value Description
0 1 Read Inputs before sending outputs on output with readback dataset
1 2 Use DH+ commands in UCMM (encapsulated DF1) message structure
2 4 The Primary network connection uses a 1761-NET-ENI converter. A CPU path is not required for this connection.
4 8 The Secondary network connection uses a 1761-NET-ENI converter. A CPU path is not required for this connection.
8 256 For Boolean and Discrete output datasets - this flag forces the bits to be packed into bytes before being sent to the PLC. Normal functionality is one bit per byte.
9 512 Forces an output data write regardless of change pending.
10 1024 When specified, the first 4 16-bit words of the output dataset are used for communication status. On loss of communication, the ControlLogix fills these words with all bits set.

3. Modified UCMM (Encapsulated DF1) message structure to support communication with DH485 devices via the DataLink GW1000 Gateway.

4. Added diagnostic log message to track Ethernet/IP stack memory usage.

For Previous Ethernet/IP VIM release notes, see below:

Please contact us for any questions about these release notes at:

MYNAH Technologies
390 South Woods Mill Road, Suite 100
Chesterfield, MO 63017
+1.636.728.2000 (voice)
+1.636-728-2001 (fax)