Features of the PS 4-300
11
04/99 AWB 2700-1311 GB
The Sucom A protocol enables markers and
status and diagnostic bits on the PLC to be
accessed directly. It provides read and write
access to the marker range, whereas only read
access to the status and diagnostic bits is
possible.
Sucom A access can be provided via the PRG
and SBI interfaces. Sucosoft S 40 contains a
function block called “SUCOM-A”
1
for this
purpose.
햾 Setpoint potentiometers
The two setpoint potentiometers P
1
and P
2
can be
set externally using a screwdriver. In other words,
setpoints can be changed without the use of a
programming device. The resolution is 10 bits. In the
programming software, the setpoint potentiometers
are addressed using the operands “IAW0.0.0.0” and
“IAW0.0.0.2”.
햿 Switch S1 for setting the bus terminating
resistors
The bus terminating resistors at the first and last
physical stations on the bus must be switched on,
whereas all the other stations must be switched off
(see "Setting the bus terminating resistors" on
page 20).
1) These function blocks are described in chapter 6 of the
manual “Language Elements for the PS 4-150/-200/-300
and PS 416” (AWB 2700-1306 GB).
H1311g.bk Seite 11 Freitag, 4. Juni 1999 1:12 13
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