Logic Inputs Setup - GE 750 Instruction Manual

750/760
Feeder Management Relay

Logic Inputs Setup

LOGIC INPUTS
SETUP
5–20
• The same logic function can be invoked both locally via contact input or front
panel keypad, and/or remotely via communications.
• Panel switches can be replaced entirely by virtual switches to save cost and
wiring.
Virtual inputs are simply memory locations in the relay which can be assigned a
value via communications or from the
menu. If the value stored in memory is "0", then the virtual input is Off; otherwise,
the virtual input is On. The state of virtual inputs is written as if it were a setpoint;
these values are non-volatile and are found in memory map locations 0090 to 00A4
hex. Momentary virtual inputs are simulated by first writing a "1" to the
corresponding register followed by writing a "0". Due to communications delay there
will be a dwell time of 50 to 200 ms. Maintained virtual inputs are simulated by
writing a "1" to the corresponding register.
PATH: SETPOINTS S3 LOGIC INPUTS
[ ] INPUT 1 NAME:
Logic Input 1
INPUT 1 ASSERTED
MESSAGE
LOGIC: Contact Close
INPUT 2 NAME:
MESSAGE
Logic Input 2
INPUT 2 ASSERTED
MESSAGE
LOGIC: Contact Close
INPUT 20 NAME:
MESSAGE
Logic Input 20
INPUT 20 ASSERTED
MESSAGE
LOGIC: Contact Close
Each logic input has two setpoints representing the name and asserted logic. The
following terms apply to all logic inputs:
• The state of a contact input is either "Open" or "Closed" and is determined
directly from the rear terminal inputs.
• The state of a virtual input is either "On" or "Off" and can be set from serial
communications or the
• The state of a logic input is either "Asserted" or "Not-Asserted".
• The state of Logic Input n (where n = 1 to 14) is determined by combining the
state of Contact Input n with the state of Virtual Input n according to the
setpoint; this is a limited form of programmable logic.
N ASSERTED LOGIC
• The state of Logic Input x (where x = 15 to 20) is determined by the state of
Virtual Input x according to the
form of programmable logic.
• A logic function is invoked when its corresponding logic input is Asserted.
• One logic input can invoke many logic functions if required.
The setpoint allows the operator to assign a user-friendly
LOGIC INPUT N NAME
description to logic inputs when replacing panel switches with a virtual switch. This
name will be displayed in the
The
LOGIC INPUT N ASSERTED
Virtual Input states to determine the Logic Input state. For Logic inputs 1 through
14, this setpoint may be assigned the following values:
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A1 STATUS
LOGIC INPUTS SETUP
Range: 18 alphanumeric characters
Range: see description below
Range: 18 alphanumeric characters
Range: see description below
↓
Range: 18 alphanumeric characters
Range: see description below
A1 STATUS VIRTUAL INPUTS
INPUT Y ASSERTED LOGIC
A1 STATUS VIRTUAL INPUTS
setpoint determines how to combine the Contact and
S3 Logic Inputs
actual values
VIRTUAL INPUTS
actual values menu.
INPUT
setpoint; this is a limited
actual values menu.
GE Multilin