Mitsubishi MELESEC-ST User Manual page 40

3 SYSTEM CONFIGURATION
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(6) Restrictions on slot width
Configure the system so that the total slot width of the MELSEC-ST system
(except the head module) is within 85cm.
Calculate the total slot width using the maximum input/output points setting sheet
given in Appendix 2 and 3. (Refer to Appendix 1 for dimensions.)
(7) Precautions for online module change
Configure the system as described in (a), (b), and then execute an online module
change according to the procedures given in (c), (d).
Executing an online module change without following the precautions in (a) to (d)
will cause a malfunction or failure.
For details of an online module change, refer to the Head Module User's Manual.
(a) Separate the power distribution module and external AUX. power supply for
each kind of the following slice modules
When constructing the system, separate the power distribution module and
external AUX. power supply for each kind of the following slice modules.
For details, refer to the system configuration example Fig. 3.4, Fig. 3.5 or
Fig. 3.6.
<Separation category>
Intelligent function module
ST1AD - , ST1DA - , ST1TD , ST1RD , ST1SS
Contact output module
ST1Y -R
I/O module (excluding contact output module)
Module other than above
(b) Create a circuit that disconnects the external device
To ensure safety, a slice module must be replaced after an external device
has been disconnected.
Install a circuit that disconnects an external device using a switch or similar
as the following diagram shows.
Within 85cm (33.5 inch)
MELSEC-ST
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