Ladder logic, Introduction, Explanations about the example programs – ProSoft Technology MVI56-S3964R User Manual
Page 35: 3 ladder logic
Ladder Logic
MVI56-S3964RT ♦ TControlLogix PlatformT
TSiemens 3964R ProtocolT
ProSoft Technology, Inc.
Page 35 of 78
3 Ladder
Logic
In This Chapter
Introduction............................................................................................ 35
Commands ............................................................................................ 36
Ladder logic is required for application of the MVI56-S3964R module. Tasks that
must be handled by the ladder logic are module data transfer, special block
handling and status data receipt. Additionally, a power-up handler may be
needed to handle the initialization of the module's data and to clear any
processor fault conditions.
The sample ladder logic, on the ProSoft Solutions CD-ROM, is extensively
commented, to provide information on the purpose and function of each rung. For
most applications, the sample ladder will work without modification.
3.1 Introduction
The example programs mentioned in the following paragraphs illustrate the
principle of how to communicate between an MVI56-S3964R and a ControlLogix
processor. All programs mentioned were tested with appropriate communication
partners.
It is up to the programmer to examine the programs in detail and integrate them
into the ControlLogix processor application.
The following setups/limitations are to be observed in the example
programs:
Changes according to the requirements of your ControlLogix system are
recommended for setups only. Limitations must not be changed.
Setup: The MVI56-S3964R resides in slot 2 of the ControlLogix chassis.
Setup: The 1756-L series controller resides in slot 0 of the ControlLogix
chassis.
ATTENTION: You must be trained in programming and operating Rockwell
Automation 1756-L series controllers and ControlLogix environment. Otherwise,
incorrect use may lead to personal injury or death, property damages or
economic loss.
3.1.1 Explanations
About the Example Programs
is the general S3964R communication program used for the following types of
3964R jobs:
April 17, 2008