
5-10
Installing Remote Base Controllers—RBCs SIMATIC 545/555/575 System Manual
PPX:505–6851–A/B and PPX:505–6850–A/B RBCs (continued)
REMOTE BASE
CONTROLLER
505-6851B
STATUS
0 - RBC GOOD
1 - SELF DIAG FAILURE
2 - MODULE MISMATCH
3 - I/O COMM TIME OUT
4 - RAM PARITY ERROR
5 - STANDBY, NO CONF
6 - ADDR MISMATCH
7 - COMM OK, NO CONF
8 - WATCHDOG TIME OUT
C - STANDBY, CONF
RS 232
RS-232 serial port
(male)
Base number
rotary switch
Status display
I/O channel port
(female)
BASE
I/O
REMOTE BASE
CONTROLLER
505-6851A
STATUS
0 - RBC GOOD
1 - SELF DIAG FAILURE
2 - MODULE MISMATCH
3 - I/O COMM TIME OUT
4 - RAM PARITY ERROR
5 - STANDBY, NO CONF
6 - ADDR MISMATCH
7 - COMM OK, NO CONF
8 - WATCHDOG TIME OUT
C - STANDBY, CONF
RS 232
BASE
I/O
Base number
thumbwheel
switch
Use a flat-head or
Phillips screwdriver to
change base number on
the 505-6851B RBC.
Note: On the rotary
switch, the hexadecimal
characters A through F
represent the following
decimal base numbers:
A = 10
B = 11
C = 12
D = 13
E = 14
F = 15
Modem F-connector
for RBC model
505-6850–A/B
Figure 5-7 RBC Status Display and Base Number Switch
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