ABB ACQ810 - ABB Cable TK505

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Quickstart Guide
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ABB PLC and drives integration using Modbus RTU
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ModbusRTU‐9‐ PLCanddrivesintegration
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Busline
Construction 2cores,twisted,withcommonshield
Conductorcrosssection >0.22mm
2
(24AWG)
‐recommendation 0.5mm
2
correspondstoØ0.8mm
Twistingrate <10/meter(symmetricallytwisted)
Coreinsulation Polyethylene(PE)
Resistancepercore <100Ω/km
Characteristicimpedance Appr.120Ω(100…150Ω)
Capacitancebetweenthecores <55nF/km(ifhigher,thenmaxbuslength
mustbereduced)
Terminatingresistors 120Ω,¼Watbothlineends
Remarks CableswithPVCcoreinsulationandacore
diameterof0.8mmcanbeuseduptoa
lengthofappr.250m.Inthiscase,thebus
terminatingresistorisappr.100Ω.
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ABBcableTK505
ForaneasyModbusins tallationintheCPUend,thepre‐madeABB cableTK505canbeused.Itincludesa9poleD‐
sub contact with built‐in end termination (120Ω) and pull‐up/pull‐down resistors (2*270Ω). This contact is
suitablefor AC500‐eCo COM1. Itcan also be usedfor AC500 COM2 (eventhoughanother voltagele
velis used),
butonlyiftheGNDwireisnotconnectedtotheModbusslaves(2‐wiresolution, preferred forAC500COMports).
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