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CIP Modbus Object Read Example. Quantum 140NOC7800 using Explicit unconnected_send request via MBP_MSTR to a 140NOC78000. Dec. 17, 2012 Rev 1.0. PLC Hardware Configuration.

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CIP Modbus Object Read Example

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cip modbus object read example

CIP Modbus Object ReadExample

Quantum 140NOC7800 usingExplicit unconnected_send request via MBP_MSTR to a 140NOC78000

Dec. 17, 2012

Rev 1.0

plc hardware configuration
PLC Hardware Configuration
  • 140NOC78000 client ( to query 140NOC78000 server ( with Explicit Messaging CIP Modbus Object READ holding register.
  • The USB connection is for Unity to PLC communications.
quantum client unity program
Quantum Client Unity Program
  • Note to add the ‘Pin negation’ on the AND_BOOL IN1 input.
eip controlbuf cip request
EIP_ControlBufCIP Request
  • EIP_ControlBuf(1) and EIP_ControlBuf(8) are Read Only and written by the PLC.
  • EIP_ControlBuf(8), Length of Received Response, will toggle between 0 and E (hex) when it is operational.
eip databuf cip request
EIP_DataBufCIP Request


28 bytes



Length of data

to send in


control and status variables
Control and Status Variables
  • Set Enable to a value of 1 to start the messaging.
  • In a successful implementation, EMActive, EMStart, and EMSuccess will flash between 0 and 1.
example program in quantum server plc
Example Program in Quantum server PLC
  • This data is incrementing every sec in the PLC to observe the data changing in the response.

CIP Response