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Technical specifications for 6ES5374-1KH21
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Manufacturer:Siemens
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Product Category:PLC Systems
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Spare Part Number:6ES5374-1KH21
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Estimated shipping dimensions:5.8x4.5x0.8cm
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Weight:0.1 kg
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Tariff Code:8537101190
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Counliy of origin:Germany
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Hardware type:SIMATIC S5 memory card
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Memory technology:Flash EPROM
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Memory capacity:256 Kbytes
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Organization:Word
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Submodule ID:500
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Controller context:SIMATIC S5 CPU 945
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Primary use:Control-program storage or transfer
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Programming requirement:Software level 6.6 or higher
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Identification rule:Retain the complete 1KH21 suffix
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Pre-installation check:Compare retained program and card identity
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Post-installation check:Verify program transfer and CPU diagnostics
Information
Overview
Manuals
Common Applications
Product Precautions
During SIMATIC S5 maintenance, Siemens 6ES5374-1KH21 carries the retained user program between the programming system and the CPU 945 without changing the controller's established I/O structure.
- The card provides 256 Kbytes of flash EPROM program capacity.
- Word organization distinguishes the 1KH21 execution in the CPU 945 memory-card table.
- Submodule identification 500 is assigned to this supported card group.
- Programming software level 6.6 or higher is required for the marked execution.
The acceptance path compares card identification, programmer software level and the transferred program before the CPU returns to its controlled operating mode.
Important Notice: verify the 256 Kbyte word-organized 1KH21 execution and use programmer software level 6.6 or higher.
Siemens 6ES5374-1KH21 Manuals & Downloads
Siemens 6ES5374-1KH21 Technical Reference (PDF)Siemens 6ES5374-1KH21 Installation & Commissioning Guide (PDF)
The first document organizes exact technical resources and interface decisions; the second provides a separate field sequence for readiness, installation, verification and handover.
Program retention
Stores the approved SIMATIC S5 CPU 945 user program in flash EPROM.
Controlled program transfer
Moves the verified program between the programming system and the target controller.
Legacy CPU maintenance
Supports exact-card replacement during CPU 945 service work.
Configuration recovery
Restores a validated controller program after identity and version checks.
Apply these checks to the exact Siemens 6ES5374-1KH21 installation before isolation, replacement or release.
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Confirm the complete 6ES5374-1KH21 marking before handling the memory card.
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Archive the current CPU 945 program and record its accepted version.
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Place the controller in the approved maintenance state before card removal.
4
Use ESD controls and protect the card contacts from contamination.
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Verify 256 Kbytes, word organization and submodule ID 500 against the service record.
6
Use programmer software level 6.6 or higher for the 1KH21 execution.
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Transfer or compare the retained program before returning the CPU to operation.
8
Review CPU diagnostics and execute the controlled machine acceptance test.
Technical notes
Handle the flash EPROM card with ESD controls, keep the accepted CPU 945 program archive, and use programmer software level 6.6 or higher. Complete a program comparison and controller diagnostic check before operation.
FAQ View All FAQ
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What capacity does Siemens 6ES5374-1KH21 provide?The card provides 256 Kbytes of flash EPROM program memory.
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How is Siemens 6ES5374-1KH21 organized?The CPU 945 memory-card table identifies the 1KH21 execution as word-organized.
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Which controller context lists Siemens 6ES5374-1KH21?It appears in the SIMATIC S5 CPU 945 technical manual as a supported memory submodule.
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What is the submodule ID for Siemens 6ES5374-1KH21?The listed submodule identification is 500.
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What is Siemens 6ES5374-1KH21 used for?It stores the control program or transfers that program to the PLC during controlled maintenance.
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Which programming software level supports Siemens 6ES5374-1KH21?The marked execution requires programmer software level 6.6 or higher.
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What should be backed up before replacing Siemens 6ES5374-1KH21?Archive the accepted CPU 945 program and its revision before removing the installed card.
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What verifies Siemens 6ES5374-1KH21 after installation?A program comparison, CPU diagnostic review and controlled functional test complete acceptance.
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