The IQ251 is a large capacity controller designed for the control of all types of building plant. It can provide up to 128 I/O points by connecting 8 I/O modules in any combination. IQ system accessory modules may be connected to the input/output channels to provide greater I/O flexibility. They enable the IQ251 to provide sufficient capability for more complex strategies. It can operate
either as a stand alone device or as part of a Building Management System.
Order example: IQ251/comms/voltage e.g. IQ251/TMNH/UK/230. I/O cards must be ordered separately
Network
Trend LAN
Controllers
AI
DI
AO
DO
Comments
Power
Type
up to 8 cards
230Vac
IQ251/UNB/230
up to 8 cards
24Vdc
IQ251/UNB/24VDC
up to 8 cards
24Vac
IQ251/UNB/24VAC
I/O Cards
AI
DI
AO
DO
Comments
Power
Type
8
8
EIN
8
EAO
8
EDO
Accessories
Description
Additional Product Type
5V powered sensors (Voltage Input) Pack of eight
LKE/5V
15V powered sensors (Voltage Input) Pack of eight
LKE/15V
10ma current source (Resistance Input) Pack of eight
LKE/10mA
Analogue input to digital input converter Pack of eight
LKE/DI
Retrofit kit to add node card to an IQ251
KIT/NODE/IQ25x
Adapter lead from supervisor to IQ25x (9 way female to RJ11)
