CTI Janus Programmable Automation Controller IOG
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3.1.6
SD Card Selection
Size
There are three sizes of SD cards: standard, mini, and micro. The SD card receptacles on the Janus controller are
designed for a standard size card. A passive adapter can be used to accommodate the smaller mini or micro sizes,
if necessary.
Capacity
The Janus controller accepts standard SD cards and high capacity SDHC cards. SD cards, which have a maximum
capacity of 2 GB, are an older technology that may not be readily available. SDHC cards have a maximum capacity
of 32 GB and are widely available. For most applications, an SDHC card with a capacity of 16GB is sufficient.
Speed
The SD card access speed is indicated by a class rating, which indicates the minimum continuous write speed. For
example, a class rating of indicates 4 MB/sec. Class 4 SD or SDHC cards are usually sufficient for use in the front
panel SD receptacle. However, an SDHC card with a class rating of
is required for the internal SD card.
3.2
Installing the Controller
3.2.1
Unpacking the Module
Open the shipping carton and remove the special anti-static bag that contains the module. Ensure you are properly
grounded and have discharged any static buildup before removing the unit from the static bag.
Do not discard the anti-static bag; use it for protection against static damage when the module is not inserted into
the I/O base.
CAUTION
The components on the Janus controller printed circuit card can be damaged by static electricity
discharge. To prevent this damage, the module is shipped in a special anti-static bag. Static
control precautions should be followed when removing the module from the bag and when
handling the printed circuit card during configuration.
