IOM2721 Input/Output Module Installation Guide
Application
The IOM2721 input/output expansion module is part of
the
Metasys
®
system Field Equipment Controller family.
Input/Output expansion modules (IOMs) expand the
number of Input/Output points connected to either a
Network Automation Engine (NAE), Network Control
Engine (NCE), Advanced Application Field Equipment
Controller (FAC), Field Equipment Controller (FEC), or
Variable Air Volume Modular Assembly (VMA) to monitor
and control a wide variety of HVAC equipment.
IOMs operate on an RS-485 BACnet
®
MS/TP Bus and
integrate into Johnson Controls
®
and third-party BACnet
systems. IOMs communicate using the BACnet MS/TP
protocol when directly connected to the FC Bus.
Note:
With Release 10.1 or later of the Controller
Configuration Tool (CCT), VMAs, FECs, and FACs
can be configured to communicate using either
the BACnet MS/TP or the N2 field bus networking
protocol. The operation of the IOM is not affected by
the selection of the BACnet MS/TP or the N2 protocol
in the host controller, when the IOM is connected to
the host controller using the SA bus.
North American emissions compliance
United States
This equipment has been tested and found to comply with
the limits for a Class A digital device pursuant to Part 15
of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when
this equipment is operated in a commercial environment.
This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in
accordance with the instruction manual, may cause
harmful interference to radio communications. Operation
of this equipment in a residential area may cause harmful
interference, in which case the users will be required to
correct the interference at their own expense.
Canada
This Class (A) digital apparatus meets all the requirements
of the Canadian Interference-Causing Equipment
Regulations.
Cet appareil numérique de la Classe (A) respecte toutes
les exigences du Règlement sur le matériel brouilleur du
Canada.
Installation
Observe these guidelines when installing an expansion
module:
• To minimize vibration and shock damage, transport the
expansion module in the original container.
• Verify that all parts shipped with the expansion module.
• Do not drop the expansion module or subject it to
physical shock.
Parts included
• One MS-IOM expansion module with removable
terminal blocks (Power and SA/FC bus are removable)
• One installation instructions sheet
Materials and special tools needed
• Three fasteners appropriate for the mounting surface
(M4 screws or #8 screws)
• One 20 cm (8 in.) or longer piece of 35 mm DIN rail and
appropriate hardware for DIN rail mount
• Small straight-blade screwdriver for securing wires in
the terminal blocks
Physical features
The following figure displays the physical features of the
IOM, and the accompanying table provides a description
of the physical features and a reference to further
information where required.
*2410144149L*
Part No. 24-10144-149 Rev. L
2019-10-18
MS-IOM2721
(barcode for factory use
only)