9440300990 33-1
DECS-250 Contact Expansion Module
33 • Contact Expansion Module
General Information
The optional CEM-2020 is a remote auxiliary device that provides additional DECS-250 contact inputs
and outputs. Two types of modules are available. A standard module (CEM-2020) provides 24 contact
outputs and a high current module (CEM-2020H) provides 18 contact outputs.
Features
CEM-2020s have the following features:
• 10 Contact Inputs
• 18 Contact Outputs (CEM-2020H) or 24 Contact Outputs (CEM-2020)
• Functionality of Inputs and Outputs assigned by BESTlogic™Plus programmable logic
• Communications via CAN Bus
Specifications
Operating Power
Nominal ...................................... 12 or 24 Vdc
Range ......................................... 8 to 32 Vdc (Withstands ride-through down to 6 Vdc for 500 ms.)
Maximum Consumption
CEM-2020 ............................ 14 W
CEM-2020H ......................... 8 W
Contact Inputs
The CEM-2020 contains 10 programmable inputs that accept normally open and normally closed, dry
contacts.
Contact Outputs
Ratings
CEM-2020
Outputs 12 through 23 .. 1 Adc at 30 Vdc, Form C, gold contacts∗
Outputs 24 through 35 .. 4 Adc at 30 Vdc, Form C, 1.2 A pilot duty†
CEM-2020H
Outputs 12 through 23 .. 2 Adc at 30 Vdc, Form C, gold contacts∗
Outputs 24 through 29 .. 10 Adc at 30 Vdc, Form C, 1.2 A pilot duty†
∗ Gold contacts intended for low voltage signaling to dry circuits. Not rated for inductive loads or pilot
duty.
† For pilot duty, the load must be in parallel with a diode rated at least 3 times the coil current and 3 times
the coil voltage.
Communication Interface
The CEM-2020 communicates with the DECS-250 through CAN1.
CAN Bus
Differential Bus Voltage .............. 1.5 to 3 Vdc
Maximum Voltage ...................... –32 to +32 Vdc with respect to negative battery terminal
Communication Rate .................. 125 or 250 kb/s
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