The MicroLogix communication driver implements communication with Rockwell MicroLogix PLCs by using its proprietary protocol.

It operates as a Master on TCP/IP networks. The communication blocks are dynamically created according to the pooling cycle defined on the AccessType for each point.


Summary Information

Communication Driver Name: MicroLogix

Implementation DLL: T.ProtocolDriver. MicroLogix.dll

Protocol: Proprietary

Interface: TCP/IP

Supported PLC types: Rockwell MicroLogix 1100 and 1400 devices

Protocol Options: None

Multi-threading: User configurable. Default is five threads to each network node

Max number of nodes: User defined

PC Hardware requirements: Standard PC Ethernet interface board

PC Software requirements

Supported Operands: 


OperandReadWriteData TypeAddress Size
N – IntegerYesYesShort2 bytes
F – Float YesYesSingle4 bytes
B – BinaryYesYesShort2 bytes
O – OutputYesYesShort2 bytes
I – Input Yes
Short2 bytes
S – StatusYesYesShort2 bytes
ST – StringYesYesASCII Max 82 bytes
DLG-DataLogging Yes
ASCII Max 109 


Channel Configuration

Protocol Options

None

Settings

TCP/IP Channel:

NodeConnections: Defines the maximum number of parallel requests that will be sent to each node (asynchronous communication)


Node Configuration

Station Configuration

TCP/IP:

  • Station syntax: <IP address>;<Port number>
  • Where:

<IP address> = IP address of the slave device in the Modbus network

<Port number> = TCP port where the slave device is listening (default is 44818)  

Ex: 192.168.1.101 ; 44818


Point Configuration

The syntax for the MicroLogix communication points is: <File Type><File Number>;<Address>

Where: 

  • File Type: Represents the Operand:
    • N Integer
    • F Float
    • B Binary
    • O Output
    • I Input
    • S Status
    • ST String
    • DLG DataLogging 
  • File Number: Numeric reference for the FileType
  • Address: Address number

For DataLogging, the syntax is: <File Type><Queue Number>:<Number of Bytes>

Examples:

  • F8:1 File Type = F, File Number = 8, Address = 1
  • F8:2 File Type = F, File Number = 8, Address = 2
  • N7:1 File Type = N, File Number = 7, Address = 1
  • B3:10 File Type = B, File Number = 3, Address = 10
  • ST11:1 File Type = ST, File Number = 11, Address = 1
  • DLG0:34 File Type = DLG, Queue Number = 0, Number of Bytes = 34

Please use the following table to calculate the Number of Bytes for the DataLogging:


DataFormatted String Size
delimiter1 character
word6 characters
long word11 characters
date10 characters
time8 characters
string89 characters
float13 characters


Troubleshoot

The status of the driver's execution can be observed through the diagnostic tools, which are:

• Trace window
• Property Watch
• Module Information

The above tools indicate if the operations have succeeded or have failed. A status of 0 (zero) means communication is successful. Negative values indicate internal driver errors, and positive values indicate protocol error codes.


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