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Driver Blocks
Error handling
During processing the driver monitors both the hardware and the values.
This results in the following error displays:
S QPARF = 1:
Parameter assignment error (see startup characteristics)
S BGF = 1:
This output indicates the module or the process values
are not available. Possible causes:
QVZ: Module time-out (incorrect address, incorrect
jumpers or module is defective),
EANK:multiple addressing/acknowledge from modules
(incorrect jumper setting)
S ENO = 0:
The operating system has recognized a general error by
itself (e.g. overflow).
Startup
Characteristics
During a startup/initial run or parameter change all parameters are checked
for permitted values. If the allowed limits are exceeded, the driver sets its
output QPARF = 1 and does not carry out any further processing in the
subsequent cycles, e.g. no I/O accesses are done and the outputs retain their
old values.
Time Response
Does not exist. If the driver output values are needed from blocks with time
response (e.g. closed-loop control block) the driver has to be installed in the
same OB before this block.
Message Behavior
Description of the message behavior.
The PCS 7 block ALARM_8P is used to generate control-system messages.
Table 3-100
Message
No.
Control-system messages of the TM_RZA block
Block
parameter
Initial start message text
1
QPARF
Parameter assignment error
2
QCOM
Communication error FM
3
QVZ
Module time-out
(S305)
S
4
EANK
Multiple addressing
(S313)
S
Table 3-101
(F410)
S
S
Assignment of the accompanying values to the block parameters
Accompanying value
3-118
Message
class
Block parameter
1
BGNR
2
KNR
Library of Driver Blocks
C79000-G8076-C711-04