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C 2.3.2)
Bipolar
PLC-outputs
for PL 110 B
The PLC-input/output
board PL 110 B is equipped
with bipolar output stages for the control
of D.C. motors.
The following
output
pairs are on the first PLC-board:
A25, A26
A27, A28
A29, A30
On the second PLC-board:
A57, A58
A59, A60
A61, A62
The programming
is acheived as follows:
for the output stages A25, A26
Output
A25 set
*
Output
A25 + 15 V
Output
A26 reset
---+
Output
A26
0 V
Output
A25 reset
B
Output
A25
0 V
Output
A26 set
w
Output
A26 + 15 V
Circuit
example:
Bipolar
outputs
when using bipolar outputs as binary outputs
+-T-----
r
A . . .
!kk
L-
ov
Output
overcurrent
protection
for the bipolar outputs
The output
for the overcurrent
protection
is set to logic "1" if the summation
of the three bipolar output
currents exceeds 0.8 - 0.9 A. This signal cannot be directly
interrogated
via the PLC. For the overcurrent
protection
to be evaluated,
this output
should be connected
to a PLC-input.
Note:
Reaching the current limit of 0.8 - 0.9 A indicates no error message! This signal must be processed
according
to requirements.
C 2.3.3)
Output
"Emergency
Stop"
The internal
"Emergency
Stop" signal is not processed by the PI-C. The
output
is set
directly
by
the
NC-part
of
the control
in order to minimise
any delay.
The sequence of the emergency
stop routine on powering up the control
(i.e. checking the emergency
stop
contact with the aid of the input E8 "Feedback
Emergency
Stop")
is described
in the interface description
for the TNC 150.
These monitoring
routines must not be implemented
in the PLC-programme,
as the signal from the input E8 is
interrogated
directly
by the NC-part of the control.
Note:
If two PLC-boards
are connected
to a control,
it is sufficient
when the "emergency
stop" output and the
"Feedback
signal emergency
stop" input are wired on board.
48
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