Ethernet Communications Modules, 3rd Edition, Rev. D
B-2
Appendix B: General Specifications
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Peerlink Function for ECOM100
Q.
Q How is the Peerlink function used on the ECOM100?
Q.
A
As of the following versions of ECOM100 firmware, a peerlink function was added.
• H0-ECOM100 v4.0.334
• H2-ECOM100 v4.0.1808
• H4-ECOM100 v4.0.1808
The peerlink function allows the ECOM100 to join a data-sharing network on which 16 data
blocks of 16 words each are automatically shared between the network devices without having
to manage the communication with ladder logic. Each member of the data-sharing network
receives data from (subscribe), and optionally sends data to (publish), all of the other members
automatically. Members of that data-sharing network can include:
• DL05 via H0-ECOM100
• DL06 via H0-ECOM100
• DL205 via H2-ECOM100
• DL405 via H4-ECOM100
Do-more CPU (via built-in Ethernet port) or with an installed H2-ECOM100
• If Do-more built-in Ethernet port is used, then peerlink function is done
with a PEERLINK instruction (i.e. no configuration necessary)
• If an H2-ECOM100 is used in a Do-more base, then H2-ECOM100 must
be configured, and the blocks would be mapped to the Do-more DLV
memory. The PEERLINK instruction, in this case, would not be used.
Once configured and enabled, the ECOM100 uses TCP/IP broadcast packets to publish the
blocks of data to the network at a fixed rate of once every 100ms. Since broadcast packets are
used, the scope of the data-sharing network is limited to the local broadcast domain.
