INSTALLATION
3-11
Hardware
and Installation User Manual
Switch
1 on the first dipswitch (DIP 1) is used for factory testing
and should be turned OFF. Switches 2 and 3 are also reserved
for
factory testing and should be turned ON.
3.4.1
Selecting I/O T
ype — TI535 Models
Some
earlier Series 505 I/O modules (manufactured prior to January 1, 1988)
do
not report module status to the CPU. Modules built after this date do report
status.
Complete the following steps to determine which type of I/O you have.
1. Disconnect all user
-supplied power from the base.
2. Remove
the I/O module.
3. Find
the serial number
label on the inside of the front bezel. If you have
a number greater than XXXX8801XXXXXX, you have a module that
reports status. If you have a serial number less than or equal to
XXXX8712XXXXXX,
you have a module that does not report status.
Switches
2 and 3 on
DIP 1 determine whether the CPU expects the status to be
reported.
If the switches are both ON, the CPU expects the status to be reported. If you
install
I/O modules that do not report status, the CPU reports an I/O mismatch
and
I/O failure.
If
the switches are both OFF
, the CPU does
not expect the status to be reported.
When
both switches are off, you can use either type of I/O.
When
the switches are mixed (ON/OFF or OFF/ON), the CPU is set for factory
tests.
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