ABB S900 Manual
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Contents
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I/O System S900Communication Interface for PROFIBUS DP, CI9203BDD010422R0101 35Additionally, the system is provided with a simulation (forcing) optionallowing you to perform important servicing and commissioning tasks. Thesimulation function serves for:• testing the applications in the PLC or the OCS,• simulating the actors if no PLC/OCS is available yet,• avoiding unwanted error messages in the case of signal failures that mayoccur when a defective module is replaced.Indicator LEDsThe CI920 has five LEDs on its front panel which indicate the followingstates.Table 4-5 CI920 LEDsLED Description1 (PW) off No power supplygreen Power okred Serious error (e.g. checksum error in ROM)2 (CA) off CAN not usedyellow CAN readyred CAN error3 (PB) off Slave is waiting for parameters / configuration datayellow Slave in DataExchange statered DP error, outputs on failsafered blinking Static diagnostics, outputs on failsafe4 (RD) off CI920 is passiveyellow CI920 activeyellow blink. CI920 active, redundant CI920 not ready5 (FD) off Configuration and parameters o.k.red blinking Configuration or parameter errorPROFIBUS - diagnosticsFunctional principleWhen the slave is in the DataExchange status, it responds to the master'soutput data telegram with input data telegrams. The slave can enter specialdata in the telegram header to inform the master about existing diagnosticdata. S900 reports all incoming and outgoing errors to the master, which thenfetches the diagnostic buffer data with the next telegram. With a 25 ms pause |
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