Entry type: Product note Entry ID: 4132236, Entry date: 08/27/1996
IM 308B Interface Module for ET 200U - Product Information
Concerns the product with Catalog No.: 6ES5 308-3UB11 IM 308 for S5-115U/135U/150U/155U _Limitations of the load-voltage monitoring function:_ Description of the problem: If the IM 308B is used in S5-135U, -150U/H or -155U/H PLCs and the load-voltage monitoring function is activated (jumper AB-EX in the power-supply unit of the central controller open), a STOP of the CPU can lead to a condition where the outputs of the distributed I/Os are not reset. Preconditions for this response are: - Operation with load-voltage monitor. - Load-voltage monitor is triggered (load voltage failure, i.e. BASP (output inhibit) is generated by the power supply). - Change of operating mode of the CPU to STOP while the load- voltage monitor is triggered (e.g. due to a fault, activation of the STOP switch, etc.). _Functional limitation:_ The above PLCs may not be operated with load-voltage monitor if an IM 308B module is plugged in, i.e. jumper AB-EX of the power supply must be in place. _Limitation of the program check function:_ If the user program is tested with the program check function, outputs of the distributed I/Os will be set even though the CPU is outputting a BASP signal (concerns PLCs S5-115/135/150/155U). If you use this function, make very sure that the setting of the outputs causes no dangerous conditions (e.g. by switching the control voltage off). -------------------------------
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