FX
2N
-2AD SPECIAL FUNCTION BLOCK
USER’S GUIDE
JY992D74701G
This manual contains text, diagrams and explanations which will guide the reader in the correct installation
and operation of the FX
2N
-2AD special function block 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
), FX
3S
/FX
3G
/FX
3GC
/
FX
3U
/FX
3UC
Programming Manual, FX
0N
/FX
1N
/FX
2N
/FX
2NC
/FX
3G
/FX
3GC
/FX
3U
/FX
3U C
SERIES
HARDWARE MANUAL of each PLC.
Compliance with EC directive (CE Marking)
This note does not guarantee that an entire mechanical module produced in accordance with the contents
of this note will comply with the following standards.
Compliance to EMC directive and LVD directive for the entire mechanical module should be checked by
the user/manufacturer. For more information please consult with your nearest Mitsubishi product provider.
Regarding the standards that comply with the main unit, please refer to either the FX series product
catalog or consult with your nearest Mitsubishi product provider.
Requirement for Compliance with EMC directive
The following products have shown compliance through direct testing (of the identified standards below)
and design analysis (through the creation of a technical construction file) to the European Directive for
Electromagnetic Compatibility (2014/30/EU) when used as directed by the appropriate documentation.
Attention
This product is designed for use in industrial applications.
Type:
Programmable Controller (Open Type Equipment)
Models: MELSEC
FX
2N
series manufactured
from December 1st, 1998 FX
2N
-2AD
Caution for EC Directive
The FX
2N
-2AD have been found to be compliant to the European standards in the aforesaid manual and
directive. However, for the very best performance from what are in fact delicate measuring and controlled
output device Mitsubishi Electric would like to make the following points;
As analog devices are sensitive by nature, their use should be considered carefully.
For users of proprietary cables (integral with sensors or actuators), these users should follow those
manufacturers installation requirements.
Mitsubishi Electric recommend that shielded cables should be used. If NO other EMC protection is provided,
then users may experience temporary loss or accuracy between ±10% in very heavy industrial areas.
However, Mitsubishi Electric suggest that if adequate EMC precautions are followed for the users
complete control system, users should expect accuracy as specified in this manual.
•
Sensitive analog cable should not be laid in the same trunking or cable conduit as high voltage
cabling. Where possible users should run analog cables separately.
•
Good cable shielding should be used. When terminating the shield at Earth - ensure that no earth
loops are accidentally created.
•
When reading analog values, EMC accuracy can be improved out by averaging the readings. This
can be achieved either through functions on the through a users program in the main unit.
Standard
Remark
EN61131-2: 2007
Programmable controllers
-
Equipment requirements and tests
Compliance with all relevant aspects of the standard.
EMI
• Radiated Emission
• Conducted Emission
EMS
• Radiated electromagnetic field
• Fast transient burst
• Electrostatic discharge
• High-energy surge
• Voltage drops and interruptions
• Conducted RF
• Power frequency magnetic field
1. Introduction
The FX
2N
-2AD type analog input block (hereafter referred to as the FX
2N
-2AD) is used to convert the
analog input of two points (voltage and current input) into a digital value of 12 bits, and to forward the
values to the Programmable Controller (hereafter referred to as a PLC).
FX
2N
-
2AD can connected to the FX
0N
, FX
1N
, FX
2N
, FX
2NC
, FX
3G
, FX
3GC
, FX
3U
, and the FX
3UC
series
Programmable Controllers.
1) The analog input is selected from the voltage or current input by the method of connecting wires.
At this time, assume the setting to be two channels common analog input (voltage or current input).
2) The analog to digital conversion characteristics can be adjusted.
3) The block occupies 8 I/O points which can be allocated from either inputs or outputs.
4) The data transfer with the PLC uses the FROM/TO instructions.
FX
3U
/FX
3UC
series PLC can use direct specification of buffer memory.
2. External Dimensions and Parts
Dimensions: mm (inches)
3. Wiring
*1
The FX
2N
-2AD cannot have 1 channel as an analog voltage input and one channel as current input because both
channels use the same offset and gain values. For current input please short circuit VIN and IIN as shown in the
diagram.
*2
Connect a 0.1 to 0.47
µ
F 25V DC capacitor with the position of *2 when there is voltage ripple in the voltage input or
there will be a lot of noise.
4. Connection with Programmable controller
1) The FX
2N
-2AD and main unit are connected by a cable on the right of the main unit.
2) Up to 4 FX
2N
-2AD units can connect to the FX
0N
series PLC, up to 5 for FX
1N,
up to 8 for FX
2N
/FX
3G
/
FX
3GC
/FX
3U
/FX
3UC
or, up to 4 for the FX
2NC
series PLC, all with powered extension units.
However the following limitation exists when the undermentioned special function blocks are connected.
FX
2N
:
Main unit and powered extension units of 32 points I/O or less. Consumption current available for
undermentioned special function blocks
≤
190mA
FX
2N
:
Main unit and powered extension units of I/O 48 points or more. Consumption current available
for undermentioned special function blocks
≤
300mA
FX
2NC
: Up to 4 undermentioned special function blocks can be connected regardless of the system I/O.
FX
0N/1N
: Main unit and powered extension units. Up to 2 undermentioned special function blocks can be
connected regardless of the system I/O.
The consumption current of the above units is to be subtracted from the service power supply of the
host PLC.
3) The blocks occupies 8 points. (The 8 points can be allocated from either inputs or outputs).
4) FX
2N
-2AD consumes 5V DC by 20mA.
The total 5V consumption of all special function blocks connected to a main unit or an extension unit
must not exceed the 5V source capacity of the system.
FX
2N
-2AD
FX
2N
-2DA
FX
0N
-3A
Consumption current of 24V DC for one unit
50mA
85mA
90mA
Mass (Weight): Approx. 0.2kg (0.44lbs)
Accessories: Special Function block number label
*2
VIN
{
IIN
{
COM
{
*1
VIN
{
IIN
{
COM
{
37.3K
Ω
250
Ω
165K
Ω
165K
Ω
37.3K
Ω
250
Ω
PLC
Extension cable
FX
2N
-2AD
AG
Voltage input 0~10V DC
Current input 4~20mA
Channel number enter
{
5. Specifications
5.1 General specification
General specifications other than the above-mentioned are the same as the main unit of the
Programmable controller. (Refer to the Hardware manual of the Programmable controller)
5.2 Power supply specification and others
5.3 Defining gain and offset
6. Allocation of buffer memory (BFM)
6.1 Buffer memory
BFM#0 :The current value of the input data for the channel specified with BFM#17 (lower 8bit data) is
stored. The current value data is stored by binary.
BFM#1:The current value of the input data (higher 4bit data) is stored. The current value data is stored
by binary.
BFM#17:b0
⋅⋅⋅
Channel (CH1,CH2) which does the analog to digital conversion is specified
.
b0=0
⋅⋅⋅
CH1
b0=1
⋅⋅⋅
CH2
b1
⋅⋅⋅
0
→1
The A/D conversion process is started.
Write/read data to the above-mentioned buffer memory according to the programming example of
"8.Program example".
Item
Content
Dielectric withstand
voltage
500V AC 1min (Between all terminals and case)
Item
Content
Analog circuits
24V DC
±
10% 50mA (Internal power supplied from the main unit)
Digital circuits
5V DC 20mA (Internal power supplied from the main unit)
Isolation
Photo-coupler isolation between analog and digital circuits.
No isolation between analog channels.
Number of occupied
I/O points
The blocks occupies either 8 input or output points
(can be either inputs or outputs)
Item
Voltage input
Current input
Range of analog input
At shipping, the unit is adjusted to a digital range of 0 to 4000 for an analog
voltage input of 0 to 10V DC. When using an FX
2N
-2AD for current or
differing voltage inputs except 0 to 10V DC, it is necessary to adjust the
offset and gain.
0 to 10V DC, 0 to 5V DC
(input resistance 200K
Ω
)
Warning-this unit may be damaged
by an input voltage in excess of
-0.5V, +15V DC
4 to 20mA (input resistance 250
Ω
)
Warning-this unit may be damaged by
an input current in excess of
-2mA, +60mA
Digital output
12bit
Resolution
2.5mV:10V/4000(At shipment)
Change depending on the input
characteristic.
4
µ
A: (20-4)A/4000
Change depending on the input
characteristic.
Integrated accuracy
±
0.1V
±
0.16mA
Processing time
2.5ms/1 channel (synchronized to the sequence program)
Input characteristics
The input characteristic is the same for each channel.
BFM
number
b15 to b8
b7 to b4
b3
b2
b1
b0
#0
Reserved
Current value of input data (lower 8bit data)
#1
Reserved
Current value of input data (higher 4bit data)
#2 to 16
Reserved
#17
Reserved
Analog to digital
conversion beginning
Analog to digital
conversion channel
#18 or
more
Reserved
D
ig
it
a
l va
lu
e
Analog value
0
10V
4000
4095
10
.238
V
Analog value :0 to 10V
Digital value :0 to 4000
(At shipment)
0
20mA
4000
4095
20
.380
m
A
4mA
Analog value :0 to 20mA
Digital value :0 to 4000
Di
gi
ta
l v
a
lue
Analog value
