ABB SCC-CEL3020 controller inventory communication module

Description

SCC-CEL3020 The Terminal Block with box terminals has 25 terminals per module, each of which accommodates

one AWG #14 (avg 2.1mm2 cross section) to AWG #22 (avg 0.36mm2 cross section) wire, or two

wires up to AWG #18 (avg. 0.86mm2 cross section). Using an external jumper reduces wire

capacity from AWG #14 (2.10mm2 ) to AWG #16 (1.32mm2 ).

The I/O Terminal Block with barrier terminals SCC-CEL3020 has 18 terminals per module. Each terminal can

accommodate one or two wires up to AWG #14 (avg 2.10mm2 cross section).

SCC-CEL3020 The I/O Terminal Block with Connectors has one 20-pin male connector per module.

The following illustration shows terminal assignments for the 24 VDC Electronic Short Circuit

Protection Output Module. The eight outputs form one group, with a common return.

SCC-CEL3020 The power that runs the module itself comes from the power supply in the Bus Interface Unit.

An external source of DC power must be provided for the switches that power the loads. Within the

module, the external power supply is connected to a 5A fuse. During operation, the module

monitors this power to be sure it is above 9.8VDC. If not,SCC-CEL3020 it is interpreted as a fault by the BIU.

LEDs

Individual LEDs (logic side), visible through the transparent portion of the module top, indicate the

on/off status of each output. The PWR LED is on when field and backplane power are present and

the module fuse is not blown.

Host Interface

SCC-CEL3020 Intelligent processing for this module is performed by the Bus Interface Unit or elsewhere in the

system. This includes configuring features such as output default and fault reporting. The module

has 16 bits (two bytes) of discrete output data. A Bus Interface Unit is required to obtain this output

data from the host and/or local processor.

After checking the Board ID and verifying that the module is receiving appropriate logic power

from the Bus Interface Unit (as reflected by the state of the module’s Power LED), the Bus

Interface Unit then sends output data to the module in serial format. During transmission, the

module automatically loops this data back to the Bus Interface Unit for verification.

Serial to parallel converters convert this data into the parallel format needed by the module. Opto

isolators isolate the module’s logic components from field outputs. Power from the external power

supply is used to drive the FETs that source current to the loads.

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