What to do if Omron SYSMAC C28K Controller shows I/O bus error I/O BUS ERR?
If the Omron Controller displays an I/O bus error, it indicates an issue in the bus line between the CPU and Units. You should check the CPU Left/Right selector switch on the Expansion I/O Unit and verify the cable connections between the Units and Racks.
What to do if Omron SYSMAC C28K displays cycle time overrun SCAN TIME OVER?
If your Omron Controller displays a cycle time overrun error (SCAN TIME OVER), it means the watchdog timer has exceeded 100 ms. To resolve this, try to reduce the cycle time if possible.
What to do if Omron Controller has a CPU error?
If your Omron Controller is showing a CPU error, it means the watchdog timer has exceeded its maximum setting (default: 130 ms). Restart the system in PROGRAM mode and check the program. You can either reduce the cycle time or reset the watchdog timer if a longer time is required.
What to do if Omron SYSMAC C28K Controller experiences a power interruption?
If the Omron Controller experiences a power interruption, meaning power has been interrupted for at least 10 ms, check the power supply voltage and power lines. Then, try to power it up again.
What to do if Omron SYSMAC C28K Controller shows memory error MEMORY ERR?
If the Omron Controller displays a memory error (MEMORY ERR), it indicates that the Memory Unit is either incorrectly mounted, missing, or a parity error has occurred. Check the Memory Unit to ensure it is properly mounted and backed up. Then, perform a Program Check Operation to find the cause of the error.
Why does my Omron Controller show a battery error BATT LOW?
If your Omron Controller is showing a battery error (BATT LOW), it means the backup battery is either missing or its voltage has dropped. Check the battery and replace it if necessary.
How to fix 'No END(01) instruction NO END INST' error on Omron SYSMAC C28K Controller?
To fix the 'No END(01) instruction NO END INST' error on your Omron Controller, write END(01) at the final address of the program.
General| Program Memory | EPROM |
|---|---|
| Data Memory | RAM |
| Operating Temperature | 0 to 55°C |
| Humidity | 10% to 90% RH (non-condensing) |
| Type | Programmable Logic Controller |
| I/O Capacity | 28 points |
| Instruction Execution Time (Basic) | 10 µs (for basic instructions) |
| Timer/Counter | 0.1s to 999.9s |
| Communication Ports | RS-232C |
| Power Supply | 100 to 240 VAC, 50/60 Hz |
| Storage Temperature | -20°C to 75°C |
| Instruction Set | Basic and Special Instructions |
Defines the target audience for the manual, including engineers and personnel involved in FA systems.
Outlines general operating guidelines and advises consulting OMRON for non-standard applications.
Details critical safety warnings regarding electrical shock and unit disassembly.
Specifies environmental conditions to avoid for proper PC operation, like direct sunlight.
Lists precautions for the safe and reliable application of PC systems.
Introduces ladder-diagram programming, PC operation, and basic terminology.
Explains the historical connection between relay logic and PC programming methods.
Defines key terms like PC, input/output devices, and control systems for clarity.
Clarifies OMRON-specific terms like "Unit" and product groupings.
Outlines the basic steps involved in programming and operating a K-type PC.
Describes devices used for programming, monitoring, and interfacing with the PC.
Lists other manuals required for programming and operating K-type PCs and units.
Provides information on hardware aspects relevant to programming and software operation.
Explains CPU indicators that provide visual information on PC operation status.
Details the basic system configuration including CPU and optional units.
Introduces various memory areas for data management and programming.
Explains how data areas are organized and how addresses are designated.
Describes the IR area's function for I/O control and work bits.
Details the SR area's flags and control bits for system monitoring and error signaling.
Explains the DM area for internal data storage and manipulation.
Describes the HR area for storing data that retains status during power interruptions.
Details the TC area for programming timers and counters and accessing their values.
Explains the TR area bits used for temporary storage of execution conditions.
Introduces how to convert ladder diagrams to mnemonic code and input programs.
Explains the terminology used for ladder diagram programming instructions.
Details the structure and components of ladder diagrams and their execution.
Describes the keyboard layout and operating modes of the programming console.
Outlines procedures for preparing the console and clearing memory before programming.
Explains how to input, modify, check, and search programs using the console.
Details instructions used for controlling individual bit status in programs.
Explains the application and usage of work bits for simplifying programming.
Provides guidelines and precautions for drawing and writing ladder diagrams.
Describes how the CPU cycles through the program and executes instructions.
Introduces the instruction sets for easy programming of complex control processes.
Explains the use of mnemonics and function codes for instructions.
Details the structure of instructions, including operands, definers, and words.
Describes data areas, definer values, and flags affected by instruction execution.
Covers basic ladder instructions like LOAD, AND, OR, and logic block instructions.
Explains instructions for controlling individual bit status (OUT, DIFU, DIFD, KEEP).
Details interlock instructions for enabling branching and controlling execution.
Explains jump instructions for skipping program sections based on execution conditions.
Describes the END instruction, required to terminate program execution.
Explains the NOP instruction, which performs no operation.
Covers instructions for timers (TIM, TIMH) and counters (CNT, CNTR, RDM, HDM).
Explains instructions for creating and manipulating shift registers (SFT, SFTR, WSFT).
Details instructions for moving data between different memory addresses (MOV, MVN).
Describes the CMP instruction for comparing data and setting flags.
Covers instructions for converting data between formats like BCD and binary (BIN, BCD, MLPX, DMPX).
Explains instructions for performing arithmetic operations on BCD data (ADD, SUB, MUL, DIV).
Details how to define, enter, and use subroutines for modular programming.
Explains STEP and SNXT instructions for creating breakpoints and sequential execution.
Covers instructions for special purposes like I/O refresh and notation insertion.
Discusses the importance of considering timing for program execution and signal timing.
Explains CPU operation cycles and factors affecting cycle time.
Provides examples of calculating cycle time based on PC configuration and instructions.
Lists execution times for various instructions under different conditions.
Explains the time taken for the PC to output a signal after receiving an input signal.
Introduces procedures for inputting, debugging, monitoring, and controlling the PC.
Covers eliminating execution errors and isolating program issues.
Details methods for monitoring and modifying data in memory areas.
Explains procedures for backing up and restoring program memory data to cassette tape.
Introduces self-diagnostic functions for identifying and correcting system abnormalities.
Describes how to display and clear system error messages using the console.
Categorizes errors into non-fatal and fatal types and explains their causes.
Lists SR area flags used for troubleshooting and error identification.
Lists available K-type C-series CPUs, their specifications, and model numbers.
Details various types of I/O Units, including their specifications, model numbers, and standards.
Lists special units like Analog Timer, Host Link, and I/O Link Units with their specifications.
Provides specifications and model numbers for mounting rails and accessories.
Lists the components included with the Factory Intelligent Terminal (FIT).
Lists components and specifications for the Graphic Programming Console (GPC).
Details various peripheral devices like programming consoles, adapters, and interface units.
Introduces the instruction sets for easy programming of complex control processes.
Explains the use of mnemonics and function codes for instructions.
Details the structure of instructions, including operands, definers, and words.
Describes data areas, definer values, and flags affected by instruction execution.
Covers basic ladder instructions like LOAD, AND, OR, and logic block instructions.
Explains instructions for controlling individual bit status (OUT, DIFU, DIFD, KEEP).
Details interlock instructions for enabling branching and controlling execution.
Explains jump instructions for skipping program sections based on execution conditions.
Describes the END instruction, required to terminate program execution.
Explains the NOP instruction, which performs no operation.
Covers instructions for timers (TIM, TIMH) and counters (CNT, CNTR, RDM, HDM).
Explains instructions for creating and manipulating shift registers (SFT, SFTR, WSFT).
Details instructions for moving data between different memory addresses (MOV, MVN).
Describes the CMP instruction for comparing data and setting flags.
Covers instructions for converting data between formats like BCD and binary (BIN, BCD, MLPX, DMPX).
Explains instructions for performing arithmetic operations on BCD data (ADD, SUB, MUL, DIV).
Details how to define, enter, and use subroutines for modular programming.
Explains STEP and SNXT instructions for creating breakpoints and sequential execution.
Covers instructions for special purposes like I/O refresh and notation insertion.
Describes operations like address designation, program search, and instruction manipulation.
Explains how to read and clear error messages displayed on the console.
Details bit/word monitoring, forced set/reset, and data modification procedures.
Covers saving, restoring, and comparing program memory data using a cassette tape.
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