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.
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:
| Operand | Read | Write | Data Type | Address Size |
|---|
| N – Integer | Yes | Yes | Short | 2 bytes |
| F – Float | Yes | Yes | Single | 4 bytes |
| B – Binary | Yes | Yes | Short | 2 bytes |
| O – Output | Yes | Yes | Short | 2 bytes |
| I – Input | Yes |
| Short | 2 bytes |
| S – Status | Yes | Yes | Short | 2 bytes |
| ST – String | Yes | Yes | ASCII | Max 82 bytes |
| DLG-DataLogging | Yes |
| ASCII | Max 109 |
Channel Configuration
Protocol Options
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:
| Data | Formatted String Size |
|---|
| delimiter | 1 character |
| word | 6 characters |
| long word | 11 characters |
| date | 10 characters |
| time | 8 characters |
| string | 89 characters |
| float | 13 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.
