Introduction; Outline; Major Features Of The Fx 3U -4Lc - Mitsubishi Electric MELSEC FX Series User Manual

FX -4LC User's Manual
3U
1.

Introduction

1.1

Outline

The temperature control block FX
(thermocouples, resistance thermometer and micro voltage input), 4 points output (open collector transistor)
and 4 points CT input is a special function block for thermometer control.
1.1.1 Major features of the FX
The 4LC has the following features.
1) Allows inputs from 4 channels.
The 4LC supports temperature sensor inputs from thermocouples and resistance thermometers as well
as micro voltage inputs.
2) Incorporates outputs from 4 channels.
The 4LC incorporates NPN open collector transistor outputs.
3) Performs heating/cooling PID control.
The 4LC handles two systems of outputs, heating output and cooling output, and performs heating/
cooling control.
4) Performs cascade control.
The 4LC performs cascade control through combination of two control loops, the master loop and slave
loop.
5) Performs control using external analog inputs/outputs.
The 4LC performs PID control using voltage/current inputs and voltage/current outputs when combined
with a special function block for analog input/output.
6) Performs auto tuning.
The 4LC can automatically measure, calculate and set optimal PID constants for the preset temperature.
7) Performs startup tuning.
The 4LC can automatically calculate and set PID constants based on the response characteristics of the
control target when control is started or when the set value (SV) is changed.
8) Detects heater disconnection.
The 4LC can detect heater disconnection using the current detector (CT).
9) Backs up set values using the EEPROM.
The 4LC can back up set values stored in buffer memories using the built-in EEPROM.
10) Connectable PLC
Connect the 4LC to the FX
An FX -CNV-IF or FX
2NC
14
-4LC (hereinafter called 4LC) equipped with 4 channel input
3U
-4LC
3U
/FX /FX Series PLC.
3G 3U 3UC
-1PS-5V is necessary to connect the 4LC with the FX
3UC
1 Introduction
1.1 Outline
PLC.
3UC