Structure Of Diag - Siemens Simatic Manual

Fail-safe function blocks for storage and retrieval machines
MOVE_POSITIVE_OK
ACK_REQ
ERROR
DIAG
3.5.1.3

Structure of DIAG

Bit
Description
No.
0 Lower end position was fallen below
1 Upper end position was exceeded
2 Actual velocity greater than the retraction
velocity
3 Reserved
4 Parameterizing error retraction velocity
5 Actual position invalid
6 Actual velocity invalid
7 Reserved
8 Reserved
9 Reserved
10 Reserved
11 Reserved
12 Reserved
13 Reserved
14 Reserved
15 Reserved
S7-Distributed Safety/SIMATIC Safety - fail-safe function blocks for storage and retrieval machines
Motion permitted in the positive direction
If a 0 signal is available at this output, then it is not permis-
sible that the machine continues to travel in the positive
Bool direction. The output is then set to 0, as soon as
SAFE_POS assumes values greater than X_POSITIVE.
If SAFE_POS again lies below X_POSITIVE, then after
acknowledgment, the output is set again.
Acknowledgment request
If a fault has occurred, but is no longer active, and can
Bool
therefore be acknowledged, then this block indicates this
using a 1 signal at ACK_REQ.
Error
This output is set if the block has been incorrectly parame-
terized – or if the block identifies a potentially dangerous
Bool
combination of input signals in operation. The output re-
mains set until an error is no longer active and has been
acknowledged.
Diagnostic word
Word Information regarding the function status and errors of the
block are output here. (also see the table below)
Reset condition
While retracting, SAFE_POS >=
X_NEGATIVE and positive edge at ACK
While retracting, SAFE_POS <=
X_POSITIVE and positive edge at ACK
SAFE_V <= SLS_THRESHOLD and posi-
tive edge at ACK
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0 < VMAX_RELEASE parameterized <=
32767
Actual position valid again
Actual velocity valid again
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