The Allen-Bradley / Rockwell Automation 1756-DHRIO is a data highway plus/remote I/O communication module. It houses a communication rate of DH+: 57.6 kbps; RIO: 57.6 kbps, 115.2 kbps; 230.4kbps. 1756DHRIO DH+ connections are 32 DH+ messages per DH+ channel. RIO connections are 32 logical rack connections per remote I/O channel; 16 block-transfer connections per remote I/O channel. Logix connections are 32.
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