I/O modules Section 8 Service
110 M&I – AC 900F Controller
I/O modules
The I/O bus of the CPU module is not designed for the connection and
disconnection of I/O modules during operation.
If an I/O module is connected or disconnected while the system is operating, an
unintentional reset or lock up of the controller may be caused.
Replacement of accessories
TD 951F
If only one display unit is provided, for instance, this unit can be removed from a
controller and connected to another controller during operation. A previous
deactivation of the TD 951F is not required for this purpose. Press the upper and
lower snap-in noses simultaneously to remove or install the TD 951F.
Battery change
Replace the battery with the controller supply voltage ON in order to avoid any data
loss.
Remove the detachable front panel of the CPU module or the display unit installed
in this position. For electrical disconnection, carefully unplug the small connector
from the battery socket. The used battery can then be removed from the battery
compartment or the battery holder by carefully pulling the battery cable. Insert the
new battery as described under Insertion of the TA 951F battery on page 95.
Connect or disconnect I/O modules only when the controller is de-energized.
Lithium batteries must not be recharged, opened or thrown into fire. Store the
batteries in a dry place. Strictly observe the applicable local environmental
regulations during disposal of used batteries.
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