Expansion 1/0 Unit - Omron SYSMAC C Series User Manual

System expansion and peripherals
Expansion 1/0 unit
Type 3G2C7-MC223/227
Type 3G2C7-MC224/228
ARM EL
Le om Le
The basic C20 comes with 28 I/O points when the DC input type CPU is
used. The number of I/O points available from the AC input type CPU is
26. If your controlled system so requires, you can increase the number of
I/O points of an expandable C20 by connecting either one or two
expansion DC input type I/O units to the DC input type CPU for a
maximum of 140 I/O points. The maximum number of I/O points is 130
when the system is configured of AC input type units.
The expansion I/O unit can be classified by two factors: the input type
{DC or AC) and the number of I/O points. The DC input type comes with
28 or 56 I/O points, whereas the AC input type offers 26 to 52 I/O points.
Explanation
When an expansion |/O unit is connected to the CPU, the input/output
channels of the expansion !/O unit and the CPU are automatically
designated.
Since the CPU's input channel is fixed to channel 00 and its output
channel is fixed to channel 05, the new input and output channels
provided by the expansion I/O unit are numbered beginning from the
channel next to the CPU's input/output channel. That is, when a 28- or
26-point expansion |/O unit (with one input and one output channel) is
connected to the CPU, the new input channel is assigned as channel 01
and the new output channel is assigned as channel 06.
Likewise, if a 56- or 52-point expansion I/O unit (with two input and two
output channels) is connected, the new input channels are assigned as
channels 01 and 02 and the new output channels are assigned as
channels 06 and 07.
in addition to the load power supply, a separate power supply is required
to drive the C20's output relays.