Gocator Line Profile Sensors: User Manual
Protocols • 646
Implicit Messaging
Implicit messaging uses UDP and is faster than explicit messaging, and is ideal for time-critical
applications. However, implicit messaging is layered on top of UDP. UDP is connectionless and data
delivery is not guaranteed. For this reason, implicit messaging is only suitable for applications where
occasional data loss is acceptable.
For detailed information on setting up implicit messaging using Allen-Bradley PLCs, see
http://lmi3d.com/sites/default/files/APPNOTE_Implicit_Messaging_with_Allen-Bradley_PLCs.pdf.
The following sections describe the implicit messaging assemblies.
Assembly Object (Class 0x04)
For implicit messaging, the Gocator Ethernet/IP object model includes the following assemblies: implicit
messaging command and implicit messaging output.
All assembly object instances are static. Data in a data byte array in an assembly object are stored in the
big endian format.
Implicit Messaging Command Assembly
Information Value
Class 0x04
Instance 0x64
Attribute Number 3
Length 32 bytes
Implicit Messaging Command Assembly
Byte Name Type Description
0 Command 8u
A bit mask where setting the following bits
will only perform the action with highest
priority*:
1 – Stop sensor
2 – Start sensor
4 – Perform stationary alignment
8 – Perform moving alignment
16 – Clear alignment
32 – Set runtime variables
64 – Load job file
*The priority of commands is currently as
follows:
1. Stop sensor
Implicit Messaging Command Assembly Information
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