SIEMENS 6ES7414-4HJ04-0AB0 Central processing unit

Q1: What is the main purpose of the 6ES7414-4HJ04-0AB0?

A1: It is the CPU 414-4H for S7-400H/F/FH systems, providing 1.4 MB work-memory and four interfaces to build a redundant, fault-tolerant PLC solution.

Q2: How many expansion racks and I/O modules can it support?

A2: Up to 21 racks and 96 PROFIBUS-DP slaves (244 byte I/O each) can be connected, giving a theoretical maximum of 65k digital I/O points.

Q3: Is online firmware update possible without stopping the process?

A3: Yes—when installed in an H-system, firmware can be updated via STEP 7 while the standby CPU continues to run, achieving a bumpless change-over.

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