Figure 6-3: Redundant power supplies each with external circuit
breaker
For 2 phase power source, external circuit breaker must be included
in both L1 and L2.
See the following table for the slow-blow fuse of the two power
supplies.
Table 6-1: Slow-blow of power supplies
Power supply Input rating Slow-blow
AC power supply 115 V AC 3.0 A
230 V AC 2.5 A
DC power supply 24 V DC 7.0 A
CE Conformity
Electrical noise produces undesirable effects in measurements and
control circuits.
Digital equipment is especially sensitive to the effects of electrical
noise. The following methods can help to reduce these effects:
n Use separate external wiring – group connecting wires into
bundles (see Guidelines for grouping wires section) and route the
individual bundles through separate conduits or metal trays.
n Use shielded cables for all I/O channels. Ground shields as
described in I/O Module installation and wiring section.
152
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