About The PS 4-300
Compact PLC
12
04/99 AWB 2700-1311 GB
헀 Programming device interface (PRG)
The interface performs the following functions:
Programming the PLC via the PC
It is used to exchange data with peripherals
equipped with a serial interface (e.g. printer,
terminals, etc.). This type of communication is
used for process data acquisition, visualisation
etc., but should not be used to exchange data for
process control.
Communication via the PRG interface (RS 232/485)
is controlled by the “SCO”
1
function block in
Sucosoft S 40. The interface is electrically isolated
from the CPU.
헁 Memory and memory module
The PS 4-300 has an internal battery-backed RAM
which is subdivided into a user program memory and
a data memory. Up to 0.5 MB is available for the user
program and as the data memory. Memory allocation
is dynamic. The capacity of the internal RAM cannot
be upgraded using plug-in memory modules. The
ZB 4-901-SF1 memory module acts as the backup
memory.
헂 Status LEDs for the PLC
The PLC’s states are indicated by four light-emitting
diodes: “Ready”, “Run”, “Not Ready” and “Battery”.
The meaning of these LEDs is described under
"Status LEDs" on page 75.
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 12 Freitag, 4. Juni 1999 1:12 13
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