Special Features Of The Cpus With Two Serial Interfaces - Siemens SIMATIC S5-115U User Manual

PLC System Start-Up and Program Test
4.4

Special Features of the CPUs with Two Serial Interfaces

CPU 943 and CPU 944 are also available with two serial interfaces. You can connect programmers
and operator panels to both interfaces. Table 4-2 shows the range of functions of the interfaces.
Connection of a programmer, operator panel or SINEC L1 at SI 1 or SI 2 can cause an increase in
the program execution time.
Table 4-2. Overview of the Functions Possible at Interface SI 1 and SI 2
Functions at SI 1
Programmer functions
no restrictions
OP functions
no restrictions
SINEC L1 slave
no restrictions
4-12
Functions at SI 2
Programmer functions
DISPL ADDR (INFO ADDR)
Display of memory locations;
Writing back of corrected
memory contents by pressing the
Enter key
DISPLAY PLC
TRANSFER from PLC to FD/PG
Block display
START, STOP
Setting the PLC from RUN to STOP
from the programmer
STATUS VAR, FORCE VAR
Test functions
SYSPAR
Display system parameters
INFOR DIR
Information about block
INFO DIR
(BLOCK: B)
Display block list
COMP
Compress
DELETE B
Overall Reset
INPUT PLC
TRANSFER from FD/PG to PLC
Entering block
OP functions
no restrictions
SINEC L1 slave
no restrictions
S5-115U Manual
EWA 4NEB 811 6130-02b