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What to do if Omron SYSMAC C20K 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 C20K Controller 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 SYSMAC C20K 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 C20K 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 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 SYSMAC C20K 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 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| Model | SYSMAC C20K |
|---|---|
| Type | Programmable Logic Controller (PLC) |
| Program Capacity | 2000 steps |
| Operating Temperature | 0°C to 55°C |
| Humidity | 10% to 90% (non-condensing) |
| Instruction Set | Basic instructions |
| Programming Language | Ladder logic |
| Power Supply | 100-240V AC |
Specifies the target audience and required knowledge for manual readers.
Outlines general rules for operating OMRON products safely and correctly.
Details critical safety warnings, including electric shock hazards.
Lists environmental conditions to avoid for PC system operation.
Provides essential safety guidelines for system installation and application usage.
Introduces Programmable Controllers (PCs) and their basic operation.
Explains the historical connection between relay logic and PC programming.
Defines key terms like PC, input/output devices, and control systems.
Clarifies OMRON-specific product terminology such as 'Unit'.
Outlines the basic steps for programming and operating a K-type PC.
Describes devices used for PC programming and interfacing.
Lists related manuals required for PC programming and operation.
Provides information on hardware aspects relevant to programming.
Explains the functions of CPU indicators for PC status monitoring.
Describes the basic components of a K-type PC system.
Explains the purpose of various memory areas for PC data management.
Details the organization and addressing of PC memory areas.
Describes the IR area for I/O points, work bits, and control.
Covers SR area flags, clock pulses, and error indicators.
Explains the DM area for internal data storage and manipulation.
Details the HR area for data storage and retention during power interruptions.
Covers TC area for timer/counter programming and access.
Explains the TR area for temporary condition storage in ladder diagrams.
Introduces program writing, conversion to mnemonic code, and basic steps.
Defines terminology related to ladder diagram programming instructions.
Explains the structure and elements of ladder diagrams.
Details the keyboard layout and PC modes of the programming console.
Outlines procedures for initial setup, password entry, and memory clearing.
Covers program input, modification, syntax checking, and cycle time display.
Explains instructions for controlling individual bit status.
Describes the application and usage of work bits for simplifying programming.
Provides guidelines for drawing clear ladder diagrams and avoiding issues.
Explains how the CPU cycles through the program for execution.
Introduces the K-type PC instruction set and their descriptions.
Explains the use of mnemonics and function codes for instructions.
Details the structure of instructions, including operands and definers.
Covers data areas, flags affected by instructions, and constant designation.
Explains basic ladder and logic block instructions like LOAD, AND, OR.
Details instructions for controlling individual bit status like OUT, DIFU, DIFD, KEEP.
Explains interlock instructions for controlling program flow and execution.
Describes jump instructions for skipping program sections conditionally.
Explains the END instruction, essential for program termination.
Covers the NOP instruction, which performs no operation.
Details timer (TIM, TIMH) and counter (CNT, CNTR, RDM, HDM) instructions.
Explains instructions for manipulating data in shift registers (SFT, SFTR, WSFT).
Covers instructions for moving data between memory addresses (MOV, MVN).
Explains the CMP instruction for comparing data and affecting flags.
Details instructions for converting data between formats (BIN, BCD, MLPX, DMPX).
Covers BCD arithmetic instructions like ADD, SUB, MUL, DIV, STC, CLC.
Explains subroutine instructions (SBN, SBS, RET) for modular programming.
Details STEP and SNXT instructions for sequential and conditional program execution.
Covers instructions for I/O refresh, end wait, and notation insertion.
Introduces program timing, cycle time, and I/O response time.
Explains the overall flow of CPU operation and cycle time factors.
Provides examples of calculating cycle time for PC configurations.
Lists execution times for all available instructions.
Explains the time taken for PC to respond to input signals.
Introduces procedures for PC program input, debugging, and monitoring.
Covers methods for eliminating execution errors and displaying error messages.
Details procedures for monitoring and modifying data in memory areas.
Explains how to save and restore program memory data using a cassette tape.
Introduces PC self-diagnostic functions for identifying system abnormalities.
Describes how to display and clear system error messages.
Lists and explains non-fatal and fatal operating error messages.
Lists SR area flags used for troubleshooting and error identification.
Lists available K-type C-series CPUs with their specifications.
Details various types of I/O Units available for K-type PCs.
Describes Analog Timer Units, Host Link Units, and I/O Link Units.
Lists mounting rails, brackets, and plates for PC installation.
Describes the FIT computer and its included components.
Lists GPC models, accessories, and interface units.
Details basic ladder and logic block instructions with symbols and operands.
Covers instructions for I/O refresh, end wait, and notation insertion.
Lists all K-type instructions with execution times and conditions.
Details operations like address designation, program search, and instruction manipulation.
Explains how to read and clear error messages using the console.
Covers bit/word monitoring, forced set/reset, and data modification.
Describes methods for changing timer/counter set values (SV).
Details procedures for saving, restoring, and comparing program data on tape.
Table showing which instructions affect ER, CY, GT, LT, and EQ flags.
Provides a reference table for converting between binary, hex, and decimal values.
Provides a template for coding ladder diagram programs with addresses and instructions.
