Siemens ET 757 E Series Instrucciones de operaciones Pagina 144

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Alarm, fault, and system messages
9.4 Diagnostics through fieldbus
ET 200pro FC
144 Operating Instructions, 11/2007, A5E01100763B AA
9.4 Diagnostics through fieldbus
9.4.1 Diagnostics through the user program
The drive's fault condition is indicated in the cyclic program via status word 1 in bit 3
(ZSW1/bit 3). The PLC program can read this bit and in the event of any faults it can
investigate their cause with the help of the function "Reading parameters": Parameter P0944
contains the quantity of active faults and r0947 the fault number (the meaning can be found
in the list manual).
Interrupts are displayed in bit 7 of the status word (ZSW1/bit 7). Once this bit has been
evaluated, if any interrupts exist their cause can be investigated with the help of the function
"Reading parameters". Parameter P2111 contains all pending interrupts and r2110 contains
the interrupt numbers, whose meanings can be found in the List Manual.
The user can then initiate suitable action:
Display
Reactions in the user program
Fault acknowledgment via the cyclic program (STW1/bit 7)
The parameters are read in PROFIdrive mode by calling SFC 59.
Note
The fault bit (ZSW1/bit 3) can also be evaluated by means of system diagnostics.
9.4.2 System diagnostics by means of standardized functions
Prerequisites
1. Diagnostics must be set in the interface module; this setting is made in the interface
module's property view during configuration.
2. Diagnostics must be set in the frequency converter; this setting is made when the
frequency converter is configured by selecting the parameter value "Enable diagnostics"
in the frequency converter's property view.
Evaluating
The user program (e.g., SIMATIC S7) has organization blocks OB82, OB86 and OB122 at its
disposal for the purpose of evaluating diagnostic errors in the ET 200 station.
OB82 for diagnostic interrupts on drive errors
OB86 for diagnostic interrupts for IM slave (ET 200 station failed)
OB122 for diagnostic interrupts upon I/O access errors.
A specific response to errors can be programmed in these organization blocks. If the OB in
question is not available, the control enters a STOP state in the event of an error. The
frequency converter's response to the CPU stop is defined by parameter P2040.
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