Mitsubishi Electric SW1DNN-WS0ADR-B, Руководство по эксплуатации

Страница: 206 / 322

Chapter 9
203
Logic programming – Function blocks
In the hardware configuration the used inputs must be configured as single channel
signals, i.e. no dual channel input evaluation on the safety I/O module.
Parameters of the function block
Parameter Possible values
Discrepancy time pair 1 0 = disabled, 10 to 500 ms in 10 ms steps. If enabled, the
value has to be greater than the logic execution time.
Discrepancy time pair 2 0 = disabled, 10 to 500 ms in 10 ms steps. If enabled, the
value has to be greater than the logic execution time.
Number of outputs  1 (Enable output)
 2 (Enable output and Discrepancy error pair 1 output)
 3 (Enable output, Discrepancy error pair 1 output and
Discrepancy error pair 2 output)
Use fault present  With
 Without
The function block evaluates its input signals in pairs. Input 1A and Input 1B form a
dual-channel evaluation and have to be complementary. Input 2A and Input 2B form
a dual-channel evaluation and also have to be complementary. A discrepancy time
can be specified for each of both input pairs.
The synchronization time is the time during which the input pairs may have different
values. As specified in the standards and regulations, the synchronization time for a
two-hand switch evaluation may not exceed 500 ms (the synchronization time is
preset and cannot be changed).
For the behaviour of the double dual-channel evaluation see Section 9.9.2 and
Section 9.9.3.
The synchronization evaluation for the Two hand control type IIIC function block differs
from the Safety gate monitoring function block with regard to the condition for the
Inactive synchronization status. For the Two hand control type IIIC function block, both
dual-channel evaluations must be Inactive, i.e. the inputs A/B of both input pairs must
be Low/High at the same time.
Furthermore the Two hand control type IIIC function block has no
Synchronization
error output, because with a two hand control it is not regarded as an error if not both
manual switches are actuated within the specified 500 ms. However this
synchronization time may not be exceeded, because otherwise the
Enable output will
not change to High.
Sequence/timing diagram
Table 90:
Parameters of the Two-hand
control type IIIC function
block
Figure 193:
Sequence/timing diagram
for the Two hand control
type IIIC function block