User`s manual

Introduction to Local Logic Programming
GFK-1742A Chapter 10 Introduction to Local Logic Programming 10-21
10
Connecting the Local Logic Editor to the DSM
VersaPro software has several communications options. The most commonly used
communications option is to connect directly to the PLC SNP port, shown in Figure 10-21 below.
Ethernet options are also available. All DSM314 programming is done through the VersaPro
interface, yielding single point of programming for the module. (The DSM314 also has a serial
port on the module faceplate which is used only for updating the DSM314’s firmware.) Local
Logic and Motion programs are stored by VersaPro to a dedicated memory space inside the PLC
CPU. The DSM314 then requests these programs by name from the CPU during configuration.
The link to the programs the DSM314 requests from the CPU is contained in the Hardware
Configuration for the PLC rack. The benefit is that programs are not module-specific but are
rack/slot specific. Thus, if there is a need to swap DSM314s within a PLC, or to replace a
DSM314, the user only needs to perform the following three steps: (1) turn off power to the PLC,
(2) change out the DSM314 modules, and (3) reapply power to the PLC. Upon powering up, the
PLC will send the correct programs and configuration settings to the DSM314s.
Series 90-30 PLC
D
S
M
SNP
(RS-485)
Personal Computer
Running VersaPro Software
Configuration, Motion Programming,
and Local Logic Programming
Figure 10-21. VersaPro Programmer Connection Diagram