ABB REO 517 Applications Manual page 426



416
Input/Output modules
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The number of inputs and outputs in a REx 5xx terminal can be selected in a variety of
combinations depending on the size of the rack. There is no basic I/O configuration of
the terminal. The table below shows the number of available inputs or output modules
for the different platform sizes.
Platform size 1/1x19"
I/O slots available 13
A number of signals are available for signalling purposes in the terminal and all are
freely programmable. The voltage level of the input/output modules is selectable at or-
der.
Figure 223 shows the operating characteristics of the binary inputs of the four voltage
levels.
3/4x19" 1/2x19"
8 3
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