PLC variables have reached the maximum quantity (For ER series, version V5.0)

52521

Alarm cause: A maximum of 150 PLC variables is supported

Corrective measures: Check the PLC variable count

Applicable equipment

Source: Fault JSON · ESTUN_fault_codes_zh_en.json · SHA-256 e318b3bb20315d070a7f50bd7649bf7dfd7d178030a4f7c736a5aa22f48095f9 · 52521

Brand	ESTUN
Updated	2026-10-27

52521

Alarm cause: A maximum of 150 PLC variables is supported

Corrective measures: Check the PLC variable count

Applicable equipment

Source: Fault JSON · ESTUN_fault_codes_zh_en.json · SHA-256 e318b3bb20315d070a7f50bd7649bf7dfd7d178030a4f7c736a5aa22f48095f9 · 52521

Brand	ESTUN
Updated	2026-10-27