Feedback Interface In Fast Mode - Siemens SIMATIC ET 200S Operating Instructions Manual

4.11

Feedback Interface in Fast Mode

Description
Refer to the table below for the assignment of the feedback interface (inputs):
Table 4- 5 Assignment of the Feedback Interface (Inputs)
Address
Bytes 0 to 3
Notes on the Feedback Bits
Bits Notes
ERR_PARA Incorrect parameter assignment for the ET 200S station.
Cause: Total steps of the absolute encoder are not in the range of values for the type of encoder.
The parameter bit is cleared when a correct parameter assignment is transmitted.
EXTF Group error absolute encoder or encoder supply short circuit
Causes:
The encoder supply is short circuited
or
No encoder connected; wire break in the encoder cable; type of encoder, transmission rate, monoflop
time do not correspond to the connected encoder; programmable encoders do not correspond to the
settings on the 1SSI; encoder is defective or faults or parity errors exist.
EXTF is reset when the causes of the errors are eliminated.
LZ This parameter is only active in isochronous mode.
When sign of life is on, the sign-of-life bit is toggled, i.e., the last sent value is inverted, each time an
encoder value is read in in isochronous mode. If a reduction is assigned in the "Encoder Sampling
Rate" parameter, the value is toggled only if an encoder value was actually read in.
STS_DI The bit displays the status of the digital input DI.
STS_DN Status direction down; for encoder value change from larger to smaller encoder positions (including
zero crossover)
STS_UP Status direction down; for encoder value change from larger to smaller encoder positions (including
zero crossover)
RDY The parameter assignment of the 1SSI is correct, and the module is executing its functions. The
displayed feedback is valid. For the absolute value encoder error, ERR_SSI is also set.
Technological Functions
Operating Instructions, 06/2010, A5E00124867-07
Assignment
Bit 31: Reserved = 0 or sign of life LZ
Bit 30: Ready for operation (feedback is valid) RDY
Bit 29: Parameter assignment error ERR_PARA;
Bit 28: Group error absolute encoder or encoder supply short circuit EXTF
Bit 27: Status DI STS_DI
Bit 26: Status DN STS_DN
Bit 25: Status UP STS_UP
Bytes 0 to 24: Encoder value
4.11 Feedback Interface in Fast Mode
1SSI
259