Using Uss Protocol Instructions To Communicate With Drives - Siemens SIMATIC S7-200 System Manual
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Using USS Protocol Instructions to
Communicate with Drives
This chapter describes the standard USS Protocol instructions that allow the
S7-200 to control a MicroMaster drive. USS Protocol instructions are a feature of
STEP 7-Micro/WIN 32 Toolbox.
STEP 7-Micro/WIN 32 Toolbox makes controlling MicroMaster drives easier by
including preconfigured subroutines and interrupt routines that are specifically
designed for USS Protocol communication. These routines appear as instructions
in the Libraries folder of the STEP 7-Micro/WIN instruction tree. With these new
instructions, you can control the physical drive and the read/write drive parameters
When you select a USS Protocol instruction, one or more associated subroutines
(USS1 through USS7) are added automatically. You do not need to pay attention to
these subroutines.
Chapter Overview
Section
11.1
11.2
11.3
11.4
11.5
S7-200 Programmable Controller System Manual
A5E00066097-02
Description
USS Protocol Instruction Requirements
Programming Sequence
USS Protocol Instructions
Connecting the Drives
Drive Setup
11
Page
11-2
11-4
11-5
11-17
11-18
11-1
- Quick Links:
- Installing an S7-200 Micro Plc
- Configuration
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settings get erased
Settings on the Siemens SIMATIC S7-200 may get erased if the memory areas are not configured to be retentive. Only the first 14 bytes of M memory (MB0 to MB13) can be configured as retentive, which means they are saved to EEPROM when the CPU loses power. If memory is not set as retentive, its contents are lost during a power cycle. Also, changes made in RUN mode may not take effect permanently until a power cycle or STOP-to-RUN transition occurs.
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