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Power and Compatibility
B-8
SIMATIC 545/555/575 System Manual
Module Compatibility with CPUs (continued)
High Speed Counter modules (PPX:5057002) manufactured prior to May
1990 will not operate properly in a 545/555 controllers local base
configuration. If a High Speed Counter is placed in a 545/555 controllers
local base configuration, the WX inputs will intermittently set to FFs, which
could cause improper operation.
NOTE: High Speed Counter modules manufactured prior to May 1990 that
have been modified for 545/555 controllers local base compatibility have the
letter A immediately following the serial number.
Before you install Series 505 High Speed Counter modules into a 545/555
local base, check the serial number of each module to ensure that it is
compatible with the 545/555 local base. Refer to Figure B-1 to understand
how to read the serial number.
!
WARNING
Do not use an unmodified Series 505 High Speed Counter module
manufactured prior to May 1990 in a 545/555 controllers local base.
In a Series 505 High Speed Counter, WX inputs may change to FFs that could
change the High Speed Counter outputs to an unsafe condition. This could
result in death or serious injury to personnel, and/or damage to equipment.
Refer to the Safety Considerations Guidelines, PPX:25880150003 (shipped with
each 545/555 controller), for details. Follow the safety installation guidelines
recommended by Siemens Energy & Automation.
Series 505 High
Speed Counter for
545/555
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