MITSUBISHI ELECTRIC Mitsubishi Programmable Logic Controller QD75D - Manual (Page 85)

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MELSEC-Q
4 INSTALLATION, WIRING AND MAINTENANCE OF THE PRODUCT
4.3.2 Wiring of the differential driver common terminal
When the differential driver output system (QD75D1, QD75D2, QD75D4) is used, a
potential difference between commons may occur between the differential driver
common terminal and the differential receiver common terminal of the drive unit. To
remove the potential difference between commons, connect the differential driver
common terminal of the QD75D1/QD75D2/QD75D4 and the differential receiver
common terminal of the drive unit.
When the common terminal of the drive unit is photocoupler-connected, the wiring to
the differential driver common terminal of the QD75D1/QD75D2/QD75D4 is not
needed since a potential difference between commons does not exist.
(For the drive unit specifications, refer to the manual of the used drive unit.)
The following shows an example of wiring to the differential driver common terminal of
the QD75D1/QD75D2/QD75D4.
Up to two cables can be connected to one differential driver common terminal. (For
details, refer to Section 3.1 "Performance specifications".
To differential receiver common terminal of drive unit
Module front
Differential driver common terminal
Module bottom
Module front
Module bottom
Insert until hook
catches.
Module side