6. Installation
6-11
6.10 Restrictions on mounting option modules
Restrictions apply to the mounting of option modules in terms of current consumption and communication
times.
The following explains the restrictions that apply when mounting option modules.
(1) Restrictions on the number of option modules that can be mounted
Table 6-1 shows the maximum number of option modules that can be mounted to a CPU unit. The total current
consumption of all modules (including the CPU module, RI/O-IF module, option modules, and PI/O modules)
is limited to 10A or less. For details about the current consumption of each module, see
6.12 Current
consumption calculation table
.
Table 6-1 Restrictions on number of option modules
Name
Model
Maximum number of
modules per CPU unit
Remarks
PS (AC power supply) LQV410
1
PS slot only
RI/O-IF
LQE950
1
IF slot only
CPU
LQP600
1
CPU slot only
FL.NET
LQE702-E
2
OD.RING
LQE510-E
2
J.NET
LQE540-E
4
D.NET
LQE770-E
4
ET.NET
LQE260-E
2
(2) Mounting restrictions based on communication times
Option modules, such as OD.RING and D.NET, periodically update I/O data at their respective communication
times. The CPU module uses the I/O data updated by each option module in the ladder program to control
applications. The ladder program runs repeatedly at a fixed interval (sequence cycle). To prevent I/O data from
being dropped, the communication time of each option module must be no more than half the sequence cycle.
The communication time of an option module is determined by the communication word setting of the
individual option module, and the number of option modules the CPU unit handles. For details on how to
calculate the communication time of an option module, see the manual for that module.
Summary of Contents for S10VE
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