I/O Block
WBPEEUI240751C0 7 - 7
Channels are numbered consecutively whether they are input
or output channels. For example, the input channels of a
DIO-400 block are numbered 01 to 16, and the output chan-
nels are numbered 17 to 24.
Operation
This section details the I/O block startup sequence, stop/reset
pushbutton operation, and initialization.
Startup
A startup sequence occurs after a power on or manual reset of
an I/O block. Plugging an I/O module into its base connects
power and begins the start up. Table 7-6 describes a success-
ful startup sequence.
The I/O block performs a series of online diagnostics tests dur-
ing startup. Refer to Diagnostics
DiagnosticsDiagnostics
Diagnostics in Section 8 for a description.
Stop/Reset Button
The stop/reset button (Fig. 7-1) is used to interrupt configura-
tion execution and to initiate a hardware reset. The button is
accessed through the small opening on the front panel. Some
type of thin rod, preferably nonmetallic, is required to press the
button.
Normally closed relay contact
Normally open relay contact
Three-wire RTD
Black letter on blue background Analog input channel
Blue letter on black background Analog output channel
Black letter on orange background Digital input channel
Orange letter on black background Digital output channel
Table 7 -5. Terminal Strip Markings an d Color C oding
(continued)
Marking/Color Description
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