(4) When the programmable controller detects an abnor mal condition, it stops the operation and all
outputs are:
• Turned off if the overcurrent or overvoltage prot ection of the power supp ly module is activated.
• Held or turned off according to the parameter setting if the self-diagnos tic function of the CPU
module detects an error such as a watchdog timer error.
Also, all outputs may be turned on if an error occurs in a part, such as an I/O control part,
where the CPU module cannot detect any error. To ensure safety operation in such a case,
provide a safety mechanism or a fail-safe circuit external to the programmable controller. For a
fail-safe circuit example, re fer to "General Safety Requirements" in the MELSEC-L CPU
Module User's Manual (Hardware Design, Maintenance and Inspection).
(5) Outputs may remain on or off due to a failure of a component such as a transistor in an output
circuit. Configure an external circuit for moni toring output signals that could cause a serious
accident.
● In an output circuit, when a load current exceeding the rated current or an overcurrent caused by a
load short-circuit flows for a long time, it may cause smoke and fire. To prevent this, configure an
external safety circuit, such as a fuse.
变频器 FR-F720-2.2K
变频器 FR-D720-2.2K
GT10触摸屏 GT1020-LBL
GT10触摸屏 GT1020-LBD2
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RS-422电缆 GT01-C200R4-8P
伺服电机 HC-SFS203B
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变频器 FR-A720-0.75K
通用型Q系列CPU Q20UDHCPU
编码器用电缆 MR-EKCBL20M-H
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变频器 FR-E720-15K
伺服驱动器 MR-J2S-20A
编码器电缆 MR-JCCBL20M-L
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变频器 FR-E720-5.5K
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保护膜 GT10-20PSCB
编码器电缆 MR-JHSCBL20M-H
伺服马达 HC-RFS203K
RS-422电缆 GT10-C200R4-8P
变频器 FR-E720-3.7K
伺服放大器 MR-J2S-200B4
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参数单元连接电缆 FR-CB205
变频器 FR-D720S-0.75K
SSCNET Ⅲ 光纤 MR-J3BUS20M-A
端子排模块用电缆 AC20TB
变频器 FR-F720-3.7K