CTI 2557-A Installation and Operation Guide
17
In this example, the 2557-A Module is inserted in slot 1 in I/O base 0. Data for channel 1 appears in
word location WX1, data for channel 2 appears in word location WX2, etc. For your particular
module, look in the chart for the number corresponding to the slot occupied by the module. If word
memory locations appear on this line, then the module is registered in the PLC memory and the module
is ready for operation.
Figure 17 Example I/O Configuration Chart
If the line is blank or erroneous, re-check the module to ensure that it is firmly seated in the slots.
Generate the PLC memory configuration chart again. If the line is still incorrect, contact your local
distributor or CTI at 1-800-537-8398 for further assistance.
NOTE:
In advanced Operating Mode the module logs in to the PLC as 16X, 16Y, 32WX and 32WY.
Because Profibus will not allow a mixed X,Y,WX, WY slave configuration the Advanced
Operating Mode is not supported over Profibus.
NOTE:
In the event a CTI analog detects an onboard module failure, the module will assert the module
fail line and report the module failure in the I/O Status Word, which is reported to the PLC CPU.
CTI strongly recommends the user application monitor the I/O Module Status Words which are
Status Words 11-26 and apply to SIMATIC® Controllers 545, 555, 560 & 565 and the 575. The
I/O Module Status Word can be used to report a module failure for an I/O Module in any of the
505 I/O slots. Please refer to Siemens® SIMATIC® 505 Programming Reference Manual for
more information. If a module failure is reported by the status word, the module should be
replaced with a working unit and the failed module sent in for repair.
