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PDF FX2N Data sheet ( Hoja de datos )

Número de pieza FX2N
Descripción User Guide
Fabricantes Mitsubishi Electric 
Logotipo Mitsubishi Electric Logotipo



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FX2N-4AD SPECIAL FUNCTION BLOCK
USER’S GUIDE
JY992D65201C
This manual contains text, diagrams and explanations which will guide the reader in the correct installation
and operation of the FX2N-4AD and should be read and understood before attempting to install or use the
unit.
Further information can be found in the FX SERIES PROGRAMMING MANUAL(ΙΙ), FX0N/FX1N/FX2N/
FX2NC SERIES HARDWARE MANUAL.
Guidelines for the Safety of the User and Protection of the FX2N-4AD
special function block.
This manual should be used by trained and competent personnel. The definition of such a person or
persons is as follows:
a) Any engineer using the product associated with this manual, should be of a competent nature,
trained and qualified to the local and national standards. These engineers should be fully aware of
all aspects of safety with regards to automated equipment.
b) Any commissioning or service engineer must be of a competent nature, trained and qualified to
the local and national standards.
c) All operators of the completed equipment should be trained to use this product in a safe and
coordinated manner in compliance to established safety practices.
Note: The term ‘completed equipment’ refers to a third party constructed device which contains or uses
the product associated with this manual.
Notes on the Symbols Used in this Manual
At various times throughout this manual certain symbols will be used to highlight points of information
which are intended to ensure the users personal safety and protect the integrity of equipment.
1) Indicates that the identified danger WILL cause physical and property damage.
2) Indicates that the identified danger could POSSIBLY cause physical and property
damage.
• Under no circumstances will Mitsubishi Electric be liable or responsible for any consequential damage
that may arise as a result of the installation or use of this equipment.
• All examples and diagrams shown in this manual are intended only as an aid to understanding the
text, not to guarantee operation. Mitsubishi Electric will accept no responsibility for the actual use of
the product based on these illustrative examples.
• Owing to the very great variety in possible application for this equipment, you must satisfy yourself as
to its suitability for your specific application.
1. INTRODUCTION
• The FX2N-4AD analog special function block has four input channels. The input channels receive analog signals and
convert them into a digital value. This is called an A/D conversion. The FX2N-4AD has maximum resolution of 12 bits.
• The selection of voltage or current based input/output is by user wiring. Analog ranges of -10 to 10V DC (resolution:
5mV), and/or 4 to 20mA, -20 to 20mA (resolution: 20 µA) may be selected.
• The FX2N-4AD can be connected to the FX0N, FX1N, FX2N, and the FX2NC series Programmable Controllers (PLC).
• Data transfer between the FX2N-4AD and the main unit is by buffer memory exchange. There are 32 buffer memories
(each of 16 bits) in the FX2N-4AD.
• The FX2N-4AD occupies 8 I/O points on the FX2N expansion bus. The 8 I/O points can be allocated from either inputs
or outputs. The FX2N-4AD draws 30mA from the 5V rail of the main unit or powered extension unit.
2. EXTERNAL DIMENSIONS
8 7 (3 .4 3 )
M o u n tin g h o le s
4 .5 m m ( 0 .1 8 ) d ia .
Weight : Approx. 0.3 kg (0.66 lbs) Dimensions : mm (inches)
4 (0 .1 6 )
5 5 (2 .1 7 )
5 5 (2 .1 7 )
D IN r a il
M o u n tin g s lo t
3 5 m m (1 .3 8 )
PO W ER
9 (0 .3 5 )
E x te n s io n c a b le
a n d c o n n e c to r
24V
A /D
4 (0 .1 6 )
24V LE D
A /D L E D
T e r m in a l s c r e w s M 3 ( 0 .1 2 )

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FX2N pdf
5) Identification Code BFM #30
The identification (or ID) code number for a Special Function Block is read using the FROM
instruction.
This number for the FX2N-4AD Special Function Block unit is K2010.
The user’s program in the PLC can use this facility in the program to identify the special function block
before commencing data transfer from and to the special function block.
CAUTION
• Values of BFM #0, #23 and #24 are copied to the EEPROM memory of the FX2N-4AD.
BFM #21 and BFM #22 are only copied when data is written to the gain/offset command
buffer BFM #22. Also, BFM #20 causes the resetting of the EEPROM memory. The
EEPROM has a life of about 10,000 cycles (changes), so do not use programs which
frequently change these BFMs.
• Due to the time needed to write to the EEPROM memory, a delay of 300 ms is required
between instructions that cause a write to the EEPROM.
Therefore, a delay timer should be used before writing to the EEPROM for a second time.
7. DEFINING GAIN AND OFFSET
Gain
(a) (b)
Offset
(d) (e) (f)
+1,000
Digital
(c)
Gain value
Analog
Digital
0
Offset value
Analog
G ain deter mines the angle or slope of the Offset is the ’Position’ of the calibrated line,
calibration line, identified at a digital value of 1000. identified at a digital value of 0.
a) Small gain value: Large steps in digital
readings
b) Zero gain value: default (5V or 20mA)
c) Large gain value: Small steps in digital
readings
d) Negative offset
e) Zero offset: default (0V or 4mA)
f) Positive offset
Offset and gain can be set independently or together. Reasonable offset ranges are -5V to +5V or -20mA
to +20mA, and gain value - offset value = 1V to 15V or 4mA to 32mA. Gain and offset can be adjusted by
software in the main unit (see program example 2)
• Bit device’s b1, b2 of the gain/offset BFM #21 should be set to 0, 1 to allow adjustment.
• Once adjustment is completed these bit devices should be set to 1, 0 to prohibit any further changes.
8. EXAMPLE PROGRAM
8.1 Basic Program
In the following example, channels CH1 and CH2 are used as voltage inputs. The FX2N-4AD block is
connected at the position of special function block No. 0. The number of averaged samples is set at 4 and
data registers D0 and D1 of the main unit receive the averaged digital data.
M8002
initial
pulse
M1
FROM K0 K30 D4 K1
CMP K2010 D4 M0
TO P K0 K0 H3300 K1
The ID code for the special function block at position "0" is
read from BFM #30 of that block and stored at D4 in the main
unit.
This is compared with K2010 to check that the block is a
FX2N-4AD, if OK M1 is turned ON. These two program steps
are not strictly needed to perform an analog read. They are
however a useful check and are recommended as good
practice.
The analog input channels (CH1, CH2) are setup by writing
H3300 to the BFM #0 of the FX2N-4AD.
TO K0 K1 K4 K2
FROM K0 K29 K4M10 K1
M10 M20
FROM K0
NO Digital output
error value is normal
K5 D0
K2
The number of averaged samples for CH1 and CH2 is set to 4
by writing 4 to the BFM #1 and #2 respectively.
Do not execute the pulse form of the instruction.
The operational status of the FX2N-4AD is read from BFM #29
and output as bit devices of the main unit.
If there are no errors in the operation of the FX2N-4AD, then
the averaged data BFM's are read.
In the case of this example BFM #5 and #6 are read into the
main unit and stored in D0 and D1. These devices contain the
averaged data for CH1 and CH2 respectively.

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