OMRON SSS Software C-series PLC Operating Instructions

OMRON Comprehensive Operation and Application Guide of SYSMAC Support Software (SSS) in C-series PLCs

In the field of industrial automation, the programming and debugging software of programmable logic controllers (PLCs) serves as a bridge between engineers and hardware systems. OMRON's SYSMAC Support Software (SSS) is such a powerful tool designed specifically for C-series PLCs. According to its official operating manual W248-E1-1A, SSS not only supports basic programming tasks, but also integrates a series of advanced functions such as system configuration, memory management, and network communication. This article aims to deeply interpret the core content of the manual, systematically explain the key technologies and practical methods of SSS in the operation of C-series PLC, and provide a professional and detailed technical reference for technical personnel.

Part 1: SSS Software Infrastructure and Operating Modes

1.1 Software positioning and applicable objects

SSS software runs on IBM PC/AT or compatible computers and is specifically designed for programming and maintaining SYSMAC C-series PLCs (such as C200H, C1000H, C500, etc.). The manual clearly states that the users of this software should have knowledge of electrical systems, usually the personnel responsible for installing, designing, and managing FA systems. The strength of SSS lies in its provision of a complete solution from project creation to system debugging.

1.2 Operation mode division: offline and online

The core operational logic of SSS revolves around two modes:

Offline operation: This is the main environment for program development, data structure design, I/O table configuration, and other work. Without connecting to the PLC, engineers can fully write, edit, and save ladder diagrams or mnemonic programs in SSS, and pre configure DM data areas, I/O tables, etc. All operation results are saved in the system workspace or disk of the computer.

Online operation: When physically connected to the PLC, SSS enters online mode. At this point, the software can perform program upload/download, real-time monitoring of PLC operating status, online editing and debugging, reading/writing data areas, etc. Online operation is a crucial step in verifying program functionality and diagnosing system issues.

Part 2: Offline Operations - The Foundation of Project Development

2.1 Programming Environment Configuration

Before starting any programming work, it is necessary to perform correct system settings, which is a prerequisite for ensuring compatibility between the program and the target PLC. The core settings include:

PC model selection: In the system settings menu, the target PLC model (such as C200H, C1000H, C500, etc.) must be clearly specified. The manual specifically states that changing the PC model may clear the programs and data in the current workspace, and caution should be exercised when operating.

Clear Memory: Before writing a new program, it is recommended to use the "Clear Memory" operation to ensure that the system workspace is clean. This operation will clear user programs, I/O comments, etc.

Display mode setting: SSS supports multiple program display modes to adapt to different programming habits. The main modes include:

UnaAnnotated ladder diagram: focuses on instruction logic and displays concisely.

Annotated ladder diagram: Display I/O annotations next to the ladder diagram for easy understanding.

Mnemonic (function key): Use function keys to input commands, suitable for quick programming.

Mnemonic (typing): Directly typing command mnemonics, in line with advanced user habits.

2.2 Practical application of ladder diagram programming

Ladder diagram is the most intuitive way in PLC programming. The ladder diagram editing function of SSS is very powerful, and its core lies in the concept of "instruction blocks".

Instruction block: An instruction block refers to a series of logical lines starting from the left bus and ending with the output instruction on the right. A single instruction block can contain up to 22 logical lines, which helps with on-screen management.

Programming: In "write mode", engineers can input various logical conditions (normally open/normally closed contacts, OR, AND) and output instructions (OUT, TIM, CNT, etc.) through function keys. For special instructions with function codes, they can be inputted through the FUN function.

Editing operations: SSS provides a variety of editing tools, including inserting/deleting rows and columns, drawing/deleting vertical and horizontal lines, and reversing the normally open/normally closed states of contacts. For example, the F8 key can connect horizontal lines, the F6 key can draw vertical lines, and/or the F9 key can quickly switch the logical state of contacts.

Annotation system: In order to improve the readability of the program, SSS supports three types of annotations:

I/O annotation: Directly attached to the input/output bit address, with a length of up to 16 characters.

Instruction annotation: attached to the output instruction on the right side to explain its function, with a length of up to 32 characters.

Block annotation: Used to add explanatory text between two instruction blocks, with a length of up to 60 characters.

Program storage: In ladder diagram mode, instruction blocks written or modified must be written to the system workspace through "store" or "insert store" operations. This is a crucial step in preventing modifications from being lost.

2.3 Mnemonic Programming Mode

For users who are accustomed to text programming or need to handle more complex logic, mnemonic patterns are a powerful complement to ladder diagrams. In mnemonic mode, the program is constructed by inputting mnemonic instructions and operands, and the program is written in real-time into the system workspace without the need for manual "storage" operations. This makes the editing efficiency of mnemonic mode very high.

2.4 Data Management: DM and I/O Tables

In addition to program logic, PLC projects also involve a large amount of data configuration.

Data Area (DM): DM (Data Storage) is a critical area for storing set values and calculation results. The DM menu of SSS provides functions for editing, copying, filling, and printing DM content. Users can view and modify DM data in hexadecimal or ASCII format. For advanced models such as C200HS, a portion of UM (User Memory) can also be allocated as an extended DM area.

I/O table: The I/O table is a list for PLC to identify its hardware configuration (such as input/output units, special units, remote I/O slave stations). The offline I/O table function allows engineers to pre configure system architecture without actual hardware. Through the I/O table menu, users can write, check, save, and print I/O tables, which provides great convenience for early project planning.

Part 3: Online Operation - System Debugging and Monitoring

3.1 Connection and Online Switching

After establishing a physical connection (via peripheral bus, Host Link, or SYSMAC NET), press Ctrl+O in SSS to enter online mode. The prerequisite for online operation is that the PC model and interface in the system settings must match the actual connection.

3.2 Monitoring and Debugging Functions

The core value of online mode lies in the monitoring and intervention of PLC during operation.

Status monitoring: The most basic online operation is to monitor the operational status of the ladder diagram. When online, the contacts on the ladder diagram will be highlighted (or changed) according to their actual on-off status, allowing engineers to visually see the execution results of the program. You can browse the entire program through the PageUp/PageDown keys.

Data monitoring: SSS provides a dedicated data monitoring area that can simultaneously monitor the status of up to 20 bits or words. Data can be displayed in hexadecimal, signed/unsigned decimal, binary, or ASCII format, greatly simplifying the data analysis process.

Forced operation: In order to simulate specific operating conditions or test program logic, SSS supports forced setting or resetting of bits in memory. The manual emphasizes the risk of this function and requires confirmation that it will not pose a danger to the controlled system before operation.

Differential monitoring: For models such as CQM1 and C200HS, SSS supports differential monitoring, which can accurately capture the instantaneous changes of a specific location from OFF to ON (rising edge) or ON to OFF (falling edge), and highlight them on the screen with a beep prompt, making it very suitable for capturing transient faults.

AI Search: This is a very intelligent debugging tool. When an output does not perform as expected, the AI search function can automatically analyze the program and move the cursor to the execution condition that is most likely to prevent the output from conducting, significantly improving the efficiency of troubleshooting.

3.3 Online Editing

Online editing is a highly valuable feature of SSS, allowing for minor modifications to the program without stopping the PLC operation. This is crucial for a production line that is currently in operation. Online editing supports modifying individual instruction blocks in MONITOR mode, and the modified program will be written to both the PC and computer workspaces simultaneously. But the manual also warns that online editing may prolong the scanning cycle and requires evaluation before modification.

Part Four: Advanced Features and Network Communication

4.1 Program and Data Processing

Global address change: When hardware configuration changes, it may be necessary to modify a large number of addresses in the program. The "Change Address" function of SSS can efficiently complete this task, supporting batch replacement of bit addresses, word addresses, and timer/counter numbers, and the option to modify corresponding I/O comments simultaneously.

EPROM processing: For situations where program solidification is required, SSS supports reading, writing, and verifying EPROM through PROM Writer. This function can convert programs in the system workspace into machine language and write them into the EPROM chip.

Program conversion: SSS supports program conversion between different platforms, such as converting C500 series programs to formats available in C2000H series.

4.2 SYSMAC NET and SYSMAC LINK Data Link

Industrial networks are an important component of modern automation systems. SSS provides powerful data link management capabilities for SYSMAC NET and SYSMAC LINK networks.

Data link table: Data link is the foundation for automatic data exchange between PLCs. SSS allows users to create and edit data link tables offline, defining the data area (such as LR area, DM area) and word count for each node's sending and receiving.

Routing table: In SYSMAC NET multi network systems, SSS needs to configure a routing table to communicate with PLCs on remote networks. The routing table specifies the bridge node addresses required to reach the target network. These configurations can be made in the system settings.

Online network operation: After online, the edited data link table can be transmitted to the PLC through SSS, which can start/stop the data link and monitor the operation status of the data link, such as communication cycle time, refresh cycle time, and error status of each node. This is crucial for the maintenance and diagnosis of network systems.

Part 5: System and File Management

5.1 System Setting Parameters

System settings are the cornerstone of the normal operation of SSS. In addition to the PC models and interfaces mentioned earlier, they also include:

I/O table UM transfer: determines whether the I/O table and/or data link table are also transferred to the user memory (UM) of the PLC during program transfer.

Printer settings: Specify the printer model for printing programs, data lists, etc.

Data disk drive: Specify the default file save path.

Output bit annotation type: Choose whether to display I/O annotations or instruction annotations for output instructions.

5.2 Document Management

SSS supports two file formats: DOS files and LSS files.

DOS file: This is the default format of SSS, with good compatibility, and can be operated using DOS commands.

LSS files: In order to be compatible with older LSS software, SSS also supports saving and reading data in LSS format. The file management menu provides directory display, file copying, renaming, deleting, and directory creation and deletion functions, allowing engineers to efficiently organize project files.

Part 6: Summary and Safety Precautions

6.1 Summary

OMRON SYSMAC Support Software (SSS) is a comprehensive and well-designed PLC development platform. It covers the entire process from project creation, programming, configuration, to on-site debugging, monitoring, and network maintenance through clear offline/online mode division. Its ladder diagram and mnemonic dual track programming mode meet the preferences of different engineers, and powerful online editing and intelligent debugging functions (such as AI search) greatly improve on-site work efficiency. For complex network systems, SSS also provides complete configuration and monitoring tools to ensure efficient and reliable operation of the system.

6.2 Safety precautions

The manual repeatedly emphasizes the importance of safety at the beginning and throughout the entire text, and any operation must follow the following principles:

Personnel safety: It is strictly prohibited to disassemble the unit or touch the terminals when powered on to prevent electric shock.

Environmental safety: Avoid use in environments with extreme temperatures, humidity, corrosive gases, or strong vibrations.

System safety: Before modifying programs, forcing set/reset, or changing PLC operating modes, it is necessary to confirm that these operations will not pose a danger to controlled equipment or personnel. The manual clearly states that failure to comply with these warnings may result in serious personal injury or even death.

Data Security: Before switching display modes or performing critical operations, it is essential to perform a 'store' operation to prevent data loss.

In summary, mastering SSS software is the key to efficiently applying OMRON C-series PLCs. It is not only a programming tool, but also an integrated engineering management platform that provides solid technical support for the entire lifecycle of automation systems.