Rockwell Automation 56RF RFID System User Manual - Manual (Page 115)

Rockwell Automation Publication 56RF-UM001A-EN-P - October 2011 115
MicroLogix 1400 Code Examples Chapter 11
Write Byte The Write Byte command (value = 14) writes bytes of user data to a tag. The user
can specify the data, the start byte, and the number of bytes to write.
Note: This command operates only on the first tag in the field.
Example Routine
• Rung 0000: Place RFID interface into the Run Mode. The bit should be
highlighted in green. If the bit is not green, right-click it and click Toggle
Bit
.
• Rung 0001: Read Input Image. Double-click the MSG box to enter the
Setup Screen. Input Size is 116 bytes (58 words). Click on the MultiHop
tab to set up an EtherNet/IP Device.
• Rung 0002: Write Output Image. Double-click the MSG box to enter the
Setup Screen. Output Size is 124 bytes (62 words). Click on the MultiHop
tab to set up an EtherNet/IP Device.
• Rung 0003: The Tag Present bit will be highlighted in green when a tag is
present. When a tag is present, clear the command value.
• Rung 0004: When the command value has been cleared, load in the
instruction parameters contained in N114 (Write Byte). N110 (Write
Single Block) could be used in place of N114.
• Rung 0005: Wait for the write command to run. The Write in Progress bit
will be highlighted in green when the command is running. When the
command has completed, the Write in Progress bit will return to its
original state. When the command has been executed and completed, copy
the data read into N100.
• Rung 0006: If there was an error with the operation, then N100:0 will
contain the error code.
Read Multiple Blocks The Read Multiple Blocks command (value = 2) reads multiple blocks of user
data from a tag. Additionally, Option Flags can be set to return information such
as the Universally Unique Identifier (UUID) or the Data Storage Format
Identifier (DSFID) of the tag.
• Option Flag 0 – Returns multiple blocks of user data
• Option Flag 1 – Returns multiple blocks of user data and the security
status of each block
Note: Unless a UUID is specified, this command will operate on the first tag in
the field.
Example Routine
• Rung 0000: Place RFID interface into the Run Mode. The bit should be
highlighted in green. If the bit is not green, right-click it and click “Toggle
Bit”.