1. DESIGN PRECAUTIONS
• 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 self-diagnosis, 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 service power supply for sensors 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.
4) Note that when an error occurs in a relay, triac or transistor output device, the output could be held 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.
伺服马达 HC-RFS203B
变频器 FR-F720-3.7K
伺服放大器 MR-J3-200A
编码器电缆 MR-JCCBL20M-L
PLC FX1S-20MT-ESS/UL
GT10触摸屏 GT1020-LBD
RS-422电缆 GT10-C200R4-8P
PLC FX1S-20MT-001
变频器 FR-F720-22K
输入模块 A1SX20EU
变频器 FR-A720-55K
变频器 FR-F720-15K
RS-422电缆 GT01-C200R4-8P
保护膜 GT10-20PSGB
变频器 FR-D720S-2.2K
变频器 FR-E720S-2.2K
PLC FX1S-20MR-D
变频器 FR-D720-1.5K
伺服电机 HC-SFS203
变频器 FR-E720-3.7K
连接器/端子台转换模块电缆 AC20TB-E
RS-422电缆 GT09-C200R4-6C
变频器 FR-A720-0.4K
QCPU（Q模式）用总线连接电缆 GT15-QC200BS
变频器 FR-E720-11K
编码器电缆 MR-JHSCBL20M-L
RS-422电缆 GT10-C200R4-25P
变频器 FR-A720-75K
GT10触摸屏 GT1020-LBDW
变频器 FR-E720-5.5K