The C30 can be ordered with a process bus interface module. This module is designed to interface with the GE Multilin
HardFiber system, allowing bidirectional IEC 61850 fiber optic communications with up to eight HardFiber merging units,
known as Bricks. The HardFiber system has been designed to integrate seamlessly with the existing UR-series applica-
tions, including protection functions, FlexLogic, metering, and communications.
The IEC 61850 process bus system offers the following benefits:
Reduces labor associated with design, installation, and testing of protection and control applications using the C30 by
reducing the number of individual copper terminations
Integrates seamlessly with existing C30 applications, since the IEC 61850 process bus interface module replaces the
traditional CT/VT modules
Communicates using open standard IEC 61850 messaging
For additional details on the HardFiber system, see GE publication GEK-113658: HardFiber Process Bus System Instruc-
Every contact input/output module has 24 terminal connections. They are arranged as three terminals per row, with eight
rows in total. A given row of three terminals can be used for the outputs of one relay. For example, for form-C relay outputs,
the terminals connect to the normally open (NO), normally closed (NC), and common contacts of the relay. For a form-A
output, there are options of using current or voltage detection for feature supervision, depending on the module ordered.
The terminal configuration for contact inputs is different for the two applications.
The contact inputs are grouped with a common return. The C30 has two versions of grouping: four inputs per common
return and two inputs per common return. When a contact input/output module is ordered, four inputs per common is used.
The four inputs per common allows for high-density inputs in combination with outputs, with a compromise of four inputs
sharing one common. If the inputs must be isolated per row, then two inputs per common return should be selected (4D
The tables and diagrams on the following pages illustrate the module types (6A, etc.) and contact arrangements that can be
ordered for the relay. Since an entire row is used for a single contact output, the name is assigned using the module slot
position and row number. However, since there are two contact inputs per row, these names are assigned by module slot
position, row number, and column position.
Figure 3–13: CONTROL POWER CONNECTION
C30 Controller System
3.2.4 PROCESS BUS MODULES
3.2.5 CONTACT INPUTS AND OUTPUTS