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47
Selecting an Installation Site
Section 3-2
3-1-4
Number of Expansion Boards
CPU Boards can be combined with Expansion I/O Boards or Analog I/O
Boards, but are subject to the following restrictions.
1,2,3...
1.
Number of Boards:
Up to a total of three Boards can be connected, including Expansion
Boards and Analog I/O Boards.
2.
The supported Board combinations according to power supply are as fol-
lows:
3.
I/O Words Restrictions:
The number of I/O words allocated in the CPM2B as input words for the
CPU Board, Expansion I/O Board, and Analog I/O Board must not exceed
the IR Area input words from IR 000 to IR 009. The words allocated as out-
put words must not exceed the IR Area output words from IR 010 to IR 019.
For example, the CPU Board is already allocated two input words and two
output words, so a total of eight words each are available for allocation to
the Expansion Boards that can be connected.
3-2
Selecting an Installation Site
The CPM2B is resistant to harsh conditions and highly reliable, but installing
the PLC in a favorable site will maximize its reliability and operating lifetime.
!Caution
Be sure to install the CPM2B correctly, as outlined in this manual. Failure to
do so may result in Board malfunction.
3-2-1
Installation Site Conditions
Note Do not install the CPM2B under any of the following conditions.
• Locations subject to direct sunlight.
• Locations subject to an ambient temperature below 0
°
C or over 55
°
C.
• Locations subject to an ambient humidity below 10% or over 90%.
• Locations subject to condensation as the result of severe changes in tem-
perature.
• Locations subject to corrosive or flammable gases.
• Locations subject to dust (especially iron dust) or salts.
• Locations subject to shock or vibration.
• Locations subject to exposure to water, oil, or chemicals.
Be sure that the conditions at the installation site conform to the CPM2B’s
general specifications. Refer to 2-1-1 General Specifications for details.
Note Provide proper shielding when installing in the following locations:
• Locations subject to static electricity or other sources of noise.
• Locations subject to strong electromagnetic fields.
• Locations subject to possible exposure to radiation.
CPU Board
power supply
Expansion I/O Boards
Analog I/O
Boards
24-V DC input
12-V DC input
24 V DC
Supported
Supported
Supported
12 V DC
Not supported
Supported
Not supported
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