Hello everyone, I am new to Omron PLC programming and I am finding it to be fairly straightforward, although I am more familiar with Siemens and Allen Bradley systems. However, I am struggling to find comprehensive information on Omron's different memory areas such as CI, HR, AR, LR, DM, WR, EM, Extended EM, and their usage. Despite finding plenty of resources on programming instructions, this basic information seems to be lacking. The CPU model I am working with is a CJ1G-CPU45. Any assistance, especially a direct link to a PDF document, would be greatly appreciated as I have already downloaded numerous resources without success. Thank you in advance.
If you're looking for the W339 manual, be sure to check out the Memory Map section for detailed information. This section covers important topics such as CIO (Actual I/O point), HR (Holding Relay Area), AR (Auxiliary Relay Area), LR (Link Relay Area), DM (Data Memory), WR (Work Area), and EM (Extended Memory). These areas are crucial for storing and transferring data within PLC systems. We hope this information is helpful for your needs.
Thank you, member.php?u=9328, for your spot-on help and support. It is greatly appreciated, gtsupport. -Paperman
Hello PaperMan, I would like to provide additional information to assist you, in addition to gt's guidance. When it comes to addressing in your system, CIO is both word and bit addressable (you can simply use the numbers). Similarly, HR is also word and bit addressable (prefixed with H) and AR is word and bit addressable (with A0 - A447 being read only). Unfortunately, LR is not available for CS / CJ series. Moreover, WR is word and bit addressable (prefixed with W), while DM is word addressable only and EM is also word addressable only. In terms of your CPU type, there are 3 banks of E (E0, E1, E3 - addressed as E3_100 for example). I hope this information proves to be helpful for you.
Paulus provided additional information to gt's assistance for addressing in the CIO module of your CPU. The CIO module includes Word and Bit addressable registers such as HR (prefixed by H), AR (prefixed by A), LR (not available for CS / CJ series), WR (prefixed by W), DM (prefixed by D), and EM (prefixed by E). These registers can be accessed at different memory addresses using specific instructions. For example, the DM and EM registers are both Word addressable and Bit addressable, with instructions like TST[350], TSTN[351], SETB[532], and RSETB[533]. Additionally, the E bank on your CPU is divided into three sections (E0, E1, and E3), which can also be addressed specifically (e.g., E3_100). This information should be helpful for optimizing your system's performance.
BITS N BYTES mentioned that instructions can determine the status of D and E bits, but they are not freely addressable within a ladder program. This limitation may still exist with the CS, CJ, and CP range. It is time to address this issue and remove the restrictions on accessing D and E bits within ladder logic programming.
Welcome to the world of Omron PLC programming! Indeed, each system has its unique characteristics and it can take a while to wrap your head around it all. A great resource that you may find helpful is Section 9 in the CJ Series Operation Manual (W394-E1-03). You can find this document on the Omron Industrial Automation website. It provides a detailed breakdown of the CJ1G-CPU45 memory areas, although it doesn't give a direct comparison to Siemens or Allen Bradley. I hope this helps and stick around, we're always here to share insights and experiences.
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Answer: - Omron PLCs have various memory areas such as CI (Clock Memory), HR (Holding Register), AR (Auxiliary Relay), LR (Link Register), DM (Data Memory), WR (Work Register), EM (Extended Memory), and Extended EM. Each memory area serves specific functions in storing and manipulating data within the PLC. 2. How can I access detailed information on Omron PLC memory areas for programming purposes? - To access comprehensive information on Omron's memory areas like CI, HR, AR, LR, DM, WR, EM, and Extended EM, you can refer to the official Omron documentation specific to your CPU model, such as the CJ1G-CPU45. Omron's official manuals and documentation provide in-depth explanations and usage guidelines for each memory area.
Answer: - While specific PDF links can vary based on the model and version of the PLC, you can typically find detailed information on Omron PLC memory areas in the product manuals and technical documentation available on the Omron website. It is recommended to search for documents related to your specific CPU model (CJ1G-CPU45) to get detailed insights into memory areas and their usage.
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