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GFK-0825F Chapter 3 Installation 3-13
3
Bus Connection for Critical Processes
Bus connections are normally considered permanent. They should never be removed while the bus
is in operation; the resulting unreliable data on the bus could cause hazardous control conditions.
If the bus controls critical processes that cannot be shut down, the Terminal Block can be wired to
the bus via an intermediate connector as shown below.
I
N
O
U
T
S1
S2
SHLD IN
SHLD OUT
Shield Out
Shield In
Serial 2
Serial 1
The connector shown is #A107204NL from Control Design, 458 Crompton Street, Charlotte NC,
28134.
Alternatively, the wire ends can be soldered together before inserting them into the terminals.
When removing the Terminal Block, cover the ends of the wires with tape to prevent shorting the
signal wires to one another or to ground.
Both of these methods allow the Terminal Block to be removed while maintaining data integrity on
the bus.