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5 INSTALLATION AND WIRING
5.5 Connection Method for the Extension Base Unit
Voltage drop when a MELSEC-Q series extension base unit is used
When the Q5B is used, the Q5B is supplied with 5VDC from the power supply module on the RQ extension base unit, a
voltage drop occurs at extension cables. Incorrect input or output may occur if the specified voltage (4.75VDC or higher) is not
supplied to the IN connector of the Q5B.
When the Q5B is used, check that the IN connector of the Q5B set as the last level is supplied with 4.75VDC or higher.
Connecting the extension base unit to the lower level of the RQ extension base unit with the shortest extension cable is
recommended to reduce the influence of the voltage drop.
The following table lists the conductor resistance value for each extension cable.
The voltage drop can be checked on the engineering tool.
The following window shows the check result.
Model Conductor resistance value for extension cable
QC05B 0.044
QC06B 0.051
QC12B 0.082
QC30B 0.172
QC50B 0.273
QC100B 0.530
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