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Risk of Property Damage:
Do not apply power to the system before checking all
wiring connections. Short circuited or improperly con-
nected wires may result in permanent damage to the
equipment.
ATTENTION
Risque de dégâts matériels:
Ne pas mettre le système sous tension avant d'avoir
vérifié tous les raccords de câblage. Des fils for-
mant un court-circuit ou connectés de façon incor-
recte risquent d'endommager irrémédiablement
l'équipement.
Important: Do not exceed the expansion module
electrical ratings. Exceeding expansion module
electrical ratings can result in permanent damage to
the expansion module and void any warranty.
Important: Use copper conductors only. Make
all wiring in accordance with local, national, and
regional regulations.
Important: Electrostatic discharge can damage
expansion module components. Use proper
electrostatic discharge precautions during
installation, setup, and servicing to avoid damaging
the expansion module.
For detailed information on configuring and wiring
an MS/TP Bus, FC bus, and SA bus, refer to the MS/TP
Communications Bus Technical Bulletin (LIT-12011034).
Terminal blocks and bus ports
See Figure 1 for terminal block and bus port locations on
the expansion module. Observe the following guidelines
when wiring an expansion module.
Input and Output terminal blocks
Most of the input terminal blocks are mounted on the
bottom of the expansion module and the output terminal
blocks are mounted on the top of the expansion module.
See Table 2 for more information about I/O terminal
functions, requirements, and ratings.
SA/FC bus terminal block
An IOM can be connected to a Sensor/Actuator (SA)
bus or a Field Controller (FC) bus, but not to both buses
simultaneously. The SA/FC bus terminal block is a
removable, 4-terminal plug that fits into a board-mounted
jack.
When connecting the IOM to an FC bus, wire the bus
terminal block plugs on the expansion module, and the
4
IOM3711 Input/Output Module Installation Guide
CAUTION
other expansion modules in a daisy-chain configuration
using 3-wire twisted, shielded cable as shown in Figure 4.
See Table 4 for more information.
Figure 4: FC bus terminal block wiring
When connecting the IOM to an SA bus, wire the bus
terminal block plugs on the expansion module, and other
SA bus devices in a daisy-chain configuration using 4-
wire twisted, shielded cable as shown in Figure 5. See
I/O wiring ratings and requirements table
information.
Figure 5: SA bus terminal block wiring
Note: The SA PWR/SHLD terminal does not supply 15
VDC. The SA PWR/SHLD terminal is isolated and can
be used to connect (daisy chain) the 15 VDC power
leads on the SA bus (Figure 5) or the cable shields on
the FC bus (Figure 4). The SA bus supervisor supplies
15 VDC to devices on the SA bus requiring power.
for more
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