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AccelMotion DC2M17 User Manual
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27 DC2M17 Driver/Controller ModuleHigh-Reliability Method - Twisted-Pair and Shielded WiringWhen units are more than one meter from each other or the host interface, it is recommendedto make connections with twisted-pair wiring, in a shielded cable bundle. This method is similarto Ethernet wiring and can use the same wire type (four twisted pairs), or a single-pair cable.The communication interface and each controller unit should be connected to the main twisted-pair wiring bus with connections as short as possible, with all D+ connections bussed to oneconductor and D- connections to the other conductor; this method minimizes electrostatic andelectromagnetic interference and noise. Connect wiring shield to ground on the host end only.Figure 15 - Twisted-pair and Shielded Wiring example (recommended)Multidrop busses like the AM Comms Bus are organized in a 'daisy-chain' or 'party-line' arrangement,where devices connect to a main cable trunk via short network stub connections. Typically these bussesare resistively ‘terminated’ at each end to control reflections that would reduce the reliability of the bus(high-speed bus architectures and termination theory are beyond the scope of this document). It isimportant to keep the wiring from each device to the main bus as short as possible, to minimizedeterioration of the signal waveforms which would not be ideally protected by the terminators andconnection topology. Ideally, these segments should also use twisted-pair leads.For both methods, add a 120 ohm termination resistor to the bus (as illustrated in the diagrams, andprovided with the CI-200) across the conductors, at the end of the bus farthest from the CI-200. Near-side termination is already implemented inside the CI-200.GroundingGrounding is another important aspect to communications – a common ground keeps all devicescommunications signals at or near the same voltage level. Wire all DC-series unit Ground connectionstogether as well as to the communications adapter ground (such as CI-200) for reliable communications,or risk creation of out-of-spec voltages, and thus damage to communications hardware.All shared ground and power leads are recommended to be connected in a ‘home-run’ arrangementfrom each unit to the single connection point at the main shared powers supply, so that voltage dropsfrom one unit are not experienced by another unit, possibly causing drive or communications errors. |
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