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

2. 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.

3. Quantum Client Unity Program
Note to add the ‘Pin negation’ on the AND_BOOL IN1 input.

4. EIP_ControlBuf CIP 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.

5. EIP_DataBuf CIP Request
header
28 bytes
message
footer
Length of data
to send in
EIP_ControlBuf[7]

6. 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.

7. 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