YASKAWA CIMR-E7 series Technical Manual

Diagnostics 3-10# Network TerminationDetermine the topology of the network. In a BUS topology, there is a definite beginning and end to the network. In a Free topology only theeither the beginning of end of the network can be determined. Refer to the diagrams below for examples of BUS and Free topologies.Network termination consists of a resistor and two capacitors as shown in the figure below. Note the polarity of the capacitors. Refer to the ìFT3120/FT3150 Smart Transceiver Data Bookî for more information on network termination. It be downloaded from www.echelon.com.Figure 3.5 ñ L ONWORKS NetworkTermination! BUS topologyBUS topology requires termination resistors at the beginning and end of the network.Table 3.5 – BUS Topology Terminator Device ValuesDevice DescriptionR 105Ω, 1%, ⅛WC1 and C2 100μF, ≥50V (typically aluminum-electrolytic)Figure 3.6 ñ L ONWORKS BUS Network Topology! Free topologyFree topology network requires only one terminator.Table 3.6 - Free Topology Terminator Device ValuesDevice DescriptionR 52.3Ω, 1%, ⅛WC1 and C2 100μF, ≥50V (typically aluminum-electrolytic)Figure 3.7 ñ L ONWORKS Free Network Topology

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