FX3U Series Programmable Controllers - User's Manual - Hardware Edition

Oct 22, 2026

Uploaded by SALUTone

FX3U series programmable controllers hardware manual provides safety precautions and installation-related guidance for main units, power types, extension units, extension blocks, adapters, display modules, and memory cassette options. It emphasizes designing external safety circuits for emergency stop, protection, and interlocks, handling PLC self-diagnosis behaviors during watchdog and I/O control errors, and ensuring secure wiring practices. The manual also covers security measures against unauthorized access and cyberattacks, as well as environment, dust, corrosive gas, vibration, mounting, and wiring/debris prevention requirements.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages532

Reading Time22 h 21 min

AccessFree to download

Safety Precautions

1. Design Precautions

2. Security Precautions

3. Installation Precautions

FX3U SERIES PROGRAMMABLE CONTROLLERS USER'S MANUAL Hardware Edition Main Unit AC Power Type FX3U-􀂅MR/ES FX3U-􀂅MT/ES FX3U-􀂅MT/ESS FX3U-􀂅MS/ES FX3U-􀂅MR/UA1 DC Power Type FX3U-􀂅MR/DS FX3U-􀂅MT/DS FX3U-􀂅MT/DSS Input/Output Powered Extension Unit FX2N-􀂅E􀂅-􀂅 Input/Output Extension Block FX2N-8E􀂅-􀂅 FX2N-16E􀂅-􀂅 Special Adapter FX3U-4HSX-ADP Display Module FX3U-7DM Memory Cassette FX3U-FLROM-􀂅 Safety Precautions (Read these precautions before use. ) Before installation, operation, maintenance or inspection of this product, thoroughly read through and understand this manual and all of the associated manuals. Also, take care to handle the module properly and safely. If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. This manual classifies the safety precautions into two categories: and . | | Indicates that incorrect handling may cause hazardous conditions, resulting in death or severe injury. | | --- | --- | | | Indicates that incorrect handling may cause hazardous conditions, resulting in medium or slight personal injury or physical damage. | Depending on the circumstances, procedures indicated by may also cause severe injury. It is important to follow all precautions for personal safety. Store this manual in a safe place so that it can be taken out and read whenever necessary. Always forward it to the end user. 1. DESIGN PRECAUTIONS | | Reference | | --- | --- | | • Make sure to have the following safety circuits outside of the PLC to ensure safe system operation even during external power supply problems or PLC failure.
Otherwise, malfunctions may cause serious accidents. | | | 1) Most importantly, have the following: an emergency stop circuit, a protection circuit, an | | | interlock circuit for opposite movements (such as normal vs. reverse rotation), and an interlock | | | circuit (to prevent damage to the equipment at the upper and lower positioning limits) .
2) Note that when the PLC CPU detects an error, such as a watchdog timer error, during selfdiagnosis, all outputs are turned off. Also, when an error that cannot be detected by the PLC CPU occurs in an input/output control block, output control may be disabled.
External circuits and mechanisms should be designed to ensure safe machinery operation in such a case.
3) Note that the output current of the 24V DC service power supply varies depending on the model and the absence/presence of extension blocks. If an overload occurs, the voltage automatically drops, inputs in the PLC are disabled, and all outputs are turned off.
External circuits and mechanisms should be designed to ensure safe machinery operation in such a case. | 145
170
191
234
254
296
319
359
446 | | 4) Note that when an error occurs in a relay, triac or transistor output device, the output could beheld either on or off. | | | For output signals that may lead to serious accidents, external circuits and mechanisms should be designed to ensure safe machinery operation in such a case. | | | | Reference | | --- | --- | | • Do not bundle the control line together with or lay it close to the main circuit or power line. As a guideline, lay the control line at least 100mm (3 .94") or more away from the main circuit or power line.
Noise may cause malfunctions.
• Install module so that excessive force will not be applied to peripheral device connectors. Failure to do so may result in wire damage/breakage or PLC failure. | 145
170
191
234
254
296
319
359
446 | Safety Precautions (Read these precautions before use. ) 2. SECURITY PRECAUTIONS | | Reference | | --- | --- | | • To maintain the security (confidentiality, integrity, and availability) of the programmable controller and the system against unauthorized access, denial-of-service (DoS) attacks, computer viruses, and other cyberattacks from

FAQs

What safety circuits should be provided outside the PLC for safe system operation?

Provide an emergency stop circuit, a protection circuit, and interlock circuits for opposite movements, plus an interlock circuit to prevent damage at upper and lower positioning limits.

What happens to outputs when the PLC CPU detects an error during self-diagnosis?

When an error such as a watchdog timer error is detected during self-diagnosis, all outputs are turned off.

What security measures does the manual recommend for the programmable controller and system?

Use appropriate measures such as firewalls, VPNs, and antivirus solutions to protect confidentiality, integrity, and availability against unauthorized access and cyberattacks.

Oct 22, 2026

Uploaded by SALUTone