An S908 network typically connects I/O modules over a long distance for redundancy and includes these Modicon platforms:
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800 Series
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SY/MAX
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Quantum
The 140CRA31908 can be installed and configured on an X80 remote drop in an M580 system to connect an architecture based on S908 to an M580 system.
In a simple Quantum architecture that includes an S908 network, a 140CPU••••• (see the arrow) is the processor. A 140CRP93•00 module on the local rack communicates with the 140CRA93•00 module in the Quantum S908 remote drop:
You can replace the 140CPU••••• in the Quantum rack with a 140CRA31908 adapter module to allow the S908 network to communicate with an M580 architecture:
With this methodology, the 140CRA31908 adapter module allows other Modicon platforms (like S908, 800 Series, and SY/MAX I/O) to migrate to an M580 architecture:
The 140CRA31908 module exchanges data through the EIO scanner service in the M580 CPU on the main local rack:
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The input data from remote drops is collected and published through the EIO scanner service of the CPU.
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The output modules are updated with the data received from the EIO scanner.
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The EtherNet/IP protocol is used for the data exchange.
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The exchanges are deterministic, which means that remote drops are scanned regularly.
This table shows the possible migration paths for an S908 user who wants to convert to an M580 architecture. This document discusses the last option only (keep the network and remote drops), which is the solution with the lowest financial cost and has the smallest impact on product or application changes:
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Use Case
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Description
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Update the network.
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Update the remote drops.
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The S908 user migrates to M580 by replacing all remote drops with X80 drops. The user is then required to change the logic, operator screens, animation tables, etc. because X80 modules do not use state RAM addressing, which is the mapping strategy that is typically used for RIO modules.
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Update the network.
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Keep the remote drops.
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The S908 user migrates to M580 but limits the overall investment by keeping much of the existing RIO modules and wiring:
NOTE: In this case, the same I/O vision variables are retained.
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Keep the network.
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Keep the remote drops.
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The S908 user retains the cabling for these reasons:
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Customers do not use quick wiring adapter modules in the S908 network. They retain Quantum remote drops that are not Ethernet-compatible.
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Customers retain existing Quantum S908 remote drops (including cabling) by adding the Quantum S908 module to the S908 network.
NOTE: In this case, the same I/O vision variables are retained.
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