Advant
®
Controller 450 User’s Guide
Chapter 5 Maintenance
5-62 3BSE 002 415R701 Rev A
DSAX 110A On-line replacement possible
Note! In general, the electrical connections between
output boards and the process is to be broken before the
board is extracted.
Alternative methods includes:
- Open terminal switches on the connection unit
- Disconnect cable which joins the board and
the connection unit.
DSBC 174 CAUTION
On-line replacement not
possible.
Before a DSBC 174/DSBC 176 is replaced, the mains
supply to the Advant Controller is to be switched off or
the process disconnected or switched off externally.
The supply may only be restored when the new
DSBC 174/DSBC 176 is installed. Important process
objects are then to be switched off externally or
disconnected to avoid damage.
When all of the red Fault LEDs on I/O boards are
extinguished, the process may be reconnected and
returned to operations in a controlled manner, preferably
in stages with the inputs first and the most critical
outputs last.
Note! If the supply to a subrack is switched on before
the DSBC 174/DSBC 176 is in place, the process
outputs in the subrack can set themselves in optional
states. For replacement of DSBC 174 when S100 I/O
bus redundancy is used, see Section 5.5.10.3,
Replacement of Redundant S100 I/O Bus Extenders.
DSDC 111 On-line replacement possible
Table 5-2. Replacement Aspects of Individual Board Types, S100 I/O (Continued)
Board type - Jumpering Comments
DSBC 176
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