Terminal blocks and bus ports
See Physical features for terminal block and bus port
locations on the CVM/CVE controllers. Observe the
following guidelines when wiring a CVM/CVE controller.
Input and Output terminal blocks
CV series controllers have removable input and output
terminal blocks. The input terminals are located on the
bottom of the controller and output terminal blocks are
located on the top of the controller. For information about
removing a terminal block, see Removing a terminal
block. For more information about I/O terminal functions,
requirements, and ratings, see Table 5.
BACnet/IP Ethernet Network Topology for
CVE controllers
CVE controllers may be connected to a BACnet/IP building
automation network in multiple ways: as daisy-chained
devices, as part of a star (also called home run) type
network, or as part of a ring network.
To daisy-chain FX-PCV1930 controllers, connect the
controllers to the bus supervisor in a chain with the
Ethernet cable connecting to the FX-PCV1930 at the ETH-1
or ETH-2 port, and connecting to the next device from the
other port. Benefits of daisy-chained networks are that
they require less physical wiring and new devices can be
added easily to the network.
In a star network, each FX-PCV1930 controller is
connected by Ethernet cable directly back to a main
switch. This configuration reduces the possibility of
network failure but requires more wiring to install.
A ring network is a chain of controllers virtually closed
by a software component in an Ethernet switch. Not
all switches support the ring topology. The dual-port
controller from Johnson Controls supports Media
Redundancy Protocol (MRP). With MRP, a ring of Ethernet
devices can overcome any single communication failure,
with a recovery time faster than a non-ring (daisy chain or
star) architecture.
For more information on network topologies for IP
Controllers, see Facility Explorer IP Networks for BACnet/IP
Controllers Configuration Guide (LIT-12012980).
FC Bus terminal block on CVM controllers
The FC Bus terminal block is a blue, removable, 4-pin
terminal block that fits into a board-mounted pin header.
When connecting the CVM to the FC Bus, wire the bus
terminal blocks on the controller and other FC Bus devices
in a daisy-chain configuration using 3-wire twisted,
shielded cable as shown in Figure 6. For more information
about FC Bus terminal functions, requirements, and
ratings, see Table 7.
Figure 6: FC Bus terminal block wiring
Table 2: FC Bus configuration
Description
1 Wiring for a terminating device on the FC Bus
2 FC Bus terminal blocks
3 Wiring for a daisy-chained device on an FC Bus segment
4 Connects to the next device on the FC Bus
5 Isolated Shield connection terminal
Note: The Shield terminal (SHD) on the FC Bus
terminal block is isolated and can be used to connect
the cable shields on the bus (Figure 6).
SA Bus terminal block
The SA Bus terminal block is an orange, removable, 4-
pin terminal block with +15 VDC that fits into a board-
mounted pin header.
When connecting an SA Bus device to the controller, wire
the SA Bus terminal block on the controller and other
SA Bus devices in a daisy-chain configuration using 4-
wire twisted, shielded cable as shown in Figure 7. For
more information about SA Bus terminal functions,
requirements, and ratings, see Table 7.
F4-CV Series VAV Terminal Equipment Controllers Installation Guide 5
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