Knowledge Base / Gateways / AN-X / AN-X2 / AN-X / Data Highway Plus

How many Data Highway Plus Nodes can a single AN-X2-AB-DHRIO communicate with?

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The AN-X2-AB-DHRIO's Data Highway Plus firmware does not have a specific limit on the number of nodes it can communicate with (beyond the inherent limits of the DH+ protocol itself), however, be aware that DH+ is a serial based token passing protocol, and thus there will be significant delays in update rates for each additional node on the network that may hold the token. Further, if there are multiple devices on the EtherNet/IP side attempting to talk through us, they will also have to take turns with each other in addition to waiting their turn on the DH+ network. As such, while the extent of the delays will vary depending on your network, our rule of thumb for time sensitive applications is to use no more then 1 EtherNet/IP device and 4 DH+ devices per AN-X2.