Entry type: Product note Entry ID: 4140084, Entry date: 08/27/1996
Notes on the Connection of 485-7LA11 Modules
Concerns the product with Order No.: 6ES5 485-7LA11 Digital I/O module for S5-115U The I/Os of this module require an external load supply voltage. For the inputs and output byte "x" this supply is connected to pin 36 (L1+) and for output byte "x+1" to pin 38 (L2+). If the L1+ supply fails (pin 36) the inputs are read as being "0" and the LEDs are switched off. Please add the following notes to the Product Leaflet, page 9: "The LEDs for the inputs and the outputs are controlled from the 5V-circuits of the module. This results in the following features: - A "1" input signal is only detected and displayed via LED if the PLC power supply and the load voltage L1+ (on pin 36) are switched on. - Output LEDs can signal a "1" status, even though the 24V load supply voltage is missing or the output is short-circuited." _Important:_ We wish to point out that the module is non-isolated and that the installation guidelines of the S5-115U Manual, particularly those concerning the reference voltage, must be adhered to. For instance, if the reference voltage of the external process signals (Mext) is not connected to the internal reference voltage (Mint or PE), wrong input signal statuses will possibly be read. -------------------------------
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