Important Points About The System Configuration - Mitsubishi Electric A1SJ71DN91 User Manual

2. SYSTEM CONFIGURATION
2.2.2

Important points about the system configuration

This section gives some important points about configuration of a DeviceNet network system.
(1) Maximum Number of Units
Units up to the number of CPU I/Os may be installed. The DN91 uses 32 I/O points and
one slot.
(2) Applicable Base Units
The DN91 can be mounted in any main base unit or extension base unit slot, with the
following exceptions.
(a) Avoid mounting the DN91 in an extension base unit with no power supply (A5
A1S5 B extension base unit) as the power supply capacity may be insufficient.
If the DN91 is mounted in this type of unit, select the power supply unit and
extension cable with due consideration to the current capacity of the power supply
unit and the voltage drop in the extension cable.
See the user's manual of your PLC CPU for details.
(b) The DN91 cannot be mounted in the final slot of the A3CPU(P21/R21) expansion
7th stage.
(3) Not Mountable in MELSECNET(II), MELSECNET/B Remote I/O Station
DN91 cannot be mounted in a MELSECNET(II), MELSECNET/B remote I/O station.
(4) Cautions When Connecting Wiring
To avoid noise interference, separate DeviceNet communication cables, power cables,
and I/O unit signal cables.
(5) No Remote Operation from Another Node
It is not enabled to read, write, or monitor the sequence program of the PLC CPU, which
contains the DN91, and the data of slave stations via nodes on the DeviceNet.
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2 4
MELSEC-A
B,