Elements of the PS 4-271
11
06/99 AWB 2700-1364 GB
Setpoint potentiometers
The two setpoint potentiometers P
1
and P
2
can be
set externally with a screwdriver. This allows you to
change setpoint values without a programming
device. The resolution is 10 bits. In the programming
software, you can address the setpoint
potentiometers with the operands “IAW0.0.0.0” and
“IAW0.0.0.2“.
Switch S1 for setting the bus terminating
resistors
The bus terminating resistors of the stations which
are physically first and last on the bus must be turned
on. The bus terminating resistors of stations between
these two must be turned off (see section "Setting of
bus terminating resistors" on Page 18).
Programming device interface (PRG)
The interface has the following functions:
Programming of the PLC with a PC
Data exchange with partner devices which have a
serial interface (e.g. printers, terminals, etc.). Data
for process control must not be exchanged.
Communication via the interface is controlled by
the “SCO” function block of Sucosoft S 40. A
description of the block can be found in the
manual “Language elements of
PS 4-150/-200/-300 and PS 416"
(AWB 2700-1306 GB). The interface is electrically
isolated from the CPU.
The parameters of the interface are fixed:
Baud rate:
9600 Baud
Data bits:
8
Stop bits:
1
Parity bits:
0
Max. transferrable data:
63 Byte
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