Depassivation Block - Fb255 - Siemens SIMATIC S5-95F Manual

Blocks and Their Functions
Special Characteristic of the DQ Test
During the DQ test, the S5-95F briefly resets the outputs to be tested. If you wish to call up the DQ
test by means of function block FB 252, then please refer to section 4.3.
9.2.7 Depassivation Block
Passivation of the I/Os can have the following causes:
• Defective sensors
• Defective or wrong cabling
• Defective modules
If you are able to remedy errors in the RUN mode, then you can use function block FB255 to re-
integrate the passivated I/Os into the control process.
During depassivation, the S5-95F tests all I/Os. That is why depassivation must be carried out in a
safe system status.
Calling and parameter assignments
Parameter Meaning
AUFT Type of job
DEPA Trigger job
PAFE Parameter error
9-22
- FB255 -
Type Assignment
I/KY 0.0: Acknowledge error
(delete error blocks in DB 254)
1,X Depassivate signal group with
X=0,1,2 to 31
(delete corresponding error
block in DB254)
I/BI Edge from 0 1 triggers FB255 job
Q/BY 00 = Test terminated and
H
depassivation successful
11 = Signal group not passivated
H
31 = Error detected in signal group,
H
signal group remains
passivated
41 = Block assigned wrong
H
parameters
D0 = Depassivation active, test
H
active
E0 = Depassivation active, waiting
H
for test
S5-95F
STL
: JU FB 255
Name : AGF:DEPA
: SIGR
: DEPA
: PAFE
EWA 4NEB 812 6210-02