Selecting I/O Type - Ti535 Models - Siemens SIMATIC TI525 Hardware And Installation 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 Type — 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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INSTALLATION
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Hardware and Installation User Manual