Subject: Seeking Feedback on Switching from 1756-OB32 to 1756-OB8 Hello Everyone, I hope this message finds you well! I have previously worked with the 1756-OB32 output module, but due to space constraints in my current setup, I am considering transitioning to the 1756-OB8. I have gone through Rockwell's documentation, which indicates that the functionality of the OB8 matches that of the OB32, albeit with a reduced number of output points. However, I would greatly appreciate insights from fellow PLC users who can confirm this equivalency and share their experiences. Thank you in advance for your assistance! I look forward to your valuable feedback. Best regards.
**Subject: Inquiry on Switching from 1756-OB32 to 1756-OB8 for Space Constraints** Hello everyone, I hope this message finds you all well! I've previously worked with the 1756-OB32 module, but due to some spatial constraints in my current setup, I need to transition to the 1756-OB8. After reviewing the official Rockwell documentation, it appears that the OB8 offers the same functionality as the OB32, albeit with fewer output points. However, I'm reaching out to see if any fellow PLC users can provide their insights on this switch. Could anyone confirm this information or share their experiences with the OB8 versus the OB32? I appreciate any assistance you can provide, and I look forward to your responses soon. Thank you in advance for your help! **Note:** Please keep in mind that substituting the OB8 for the OB32 will not save any physical space, as both modules share the same dimensions.
Both modules deliver identical functionality and share the same physical dimensions. A notable advantage of the OB8 module is that it provides ample wiring space for installers, making the setup process much easier. Our company policy advises against using a 32-channel card unless it is specifically requested by the client, primarily due to wiring constraints. Utilizing 32 cores of 0.75mm wiring can often be unwieldy, and attempting to replace a single core after it has been connected can prove to be quite challenging.
Our company adheres to a policy of not utilizing 32-channel cards unless specifically requested by the client, primarily due to spatial constraints with wiring. Employing 32 cores of 0.75 is impractical, and replacing a single core once it has been installed can prove to be quite challenging. To enhance our efficiency and overall appearance, we purchase pre-assembled cables from Rockwell if we do opt for 32-channel cards. Though this option is more expensive, it significantly improves the organization of our wiring system, eliminating the hassle for electricians who would otherwise need to disentangle wires from the loom to check and trace connections to the card. This approach not only streamlines our workflow but also enhances the visual appeal of our installations. For clients considering wiring solutions, choosing the right cables and card configurations is crucial for avoiding complications down the line.
I choose to utilize the 16-point input cards due to their optimal density, allowing for easy integration of 18 AWG #18 wires while securely closing the enclosure. The same principle applies to the 1769 input cards. Although the 32-point cards are double the width, they do not offer double the wiring space, making it challenging to close the front door of the card unless you use significantly smaller gauge wires.
User harryggianakis commented on the need to switch to the 1756-OB8 module due to constraints related to available space. Could you clarify what you mean by "space limitations"? In response, harryggianakis mentioned that after examining the Rockwell documentation, it appears that the OB8 module offers the same functionality as the OB32, just with fewer input/output points. You're absolutely correct; the pricing is an important factor to consider: - 1756-OB8: Approximately $500 - 1756-OB16E: Approximately $600 - 1756-OB16I: Approximately $800 - 1756-OB32: Approximately $750 When choosing Rockwell modules, balancing space requirements and cost is essential for optimal system performance.
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