Siemens SIMATIC FM 353 Manual page 254

Description of Functions
Error messages
The following table lists the errors that can occur in the execution of the Measure-
ment function.
Error
Travel er- The "Digital input not parameterized" error is signaled when a measurement function is
rors selected without a digital input having been parameterized (see Troubleshooting, Table
11-7, Class 3 No. 30).
Operator The "Measurement function undefined" error is signaled when both measuring functions
contr. errors are selected (see Troubleshooting, Table 11-6, Class 2 No. 16).
Measuring An erroneous length measurement is indicated by signaling back the length "−1." Possible
error causes include:
S
Resynchronization in the Reference-Point Approach mode while a measurement is in
progress
S
Execution of the Set Reference Point function while a measurement is in progress
S
Direction of travel at the falling edge is opposite to the direction of travel of the previous
rising edge
Measurement−value checkback signals
The checkback signal ME (see Section 9.1) signals the status of function execu-
tion, as follows:
"ME"
S
0 the Length Measurement and Inpro-
cess Measurement functions are inac-
tive
S
with Start after a prior measurement
1 With the front edge of the touch probe sig-
nal (= Inprocess Measurem. is in progr.)
Reading out the measured values
After performing the "Length measurement" and "In−process measurement" func-
tins you can read out the measured values from the FM 353 by calling the
POS_MSRM block using the AW-DB read job, DBB43.7 (see Section 6.3.5).
The measured values read out are valid for the performed measuring process
starting from the "ME" checkback signal until the edge of the subsequent
measuring job arives.
9-54
Inprocess measurement
Significance
Length measurement
S
the Length Measurement and Inpro-
cess Measurement functions are inac-
tive
S
with front edge of the touch probe sig-
nal after a prior measurement
With the back edge of the touch probe sig-
nal (= Length Measurement is in progress)
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0