FX
2N
-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 FX
2N
-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
), FX
0N
/FX
1N
/FX
2N
/
FX
2NC
SERIES HARDWARE MANUAL.
Guidelines for the Safety of the User and Protection of the FX
2N
-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 FX
2N
-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 FX
2N
-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
µ
A) may be selected.
•
The FX
2N
-4AD can be connected to the FX
0N
, FX
1N
, FX
2N
, and the FX
2NC
series Programmable Controllers (PLC).
•
Data transfer between the FX
2N
-4AD and the main unit is by buffer memory exchange. There are 32 buffer memories
(each of 16 bits) in the FX
2N
-4AD.
•
The FX
2N
-4AD occupies 8 I/O points on the FX
2N
expansion bus. The 8 I/O points can be allocated from either inputs
or outputs. The FX
2N
-4AD draws 30mA from the 5V rail of the main unit or powered extension unit.
2. EXTERNAL DIMENSIONS
P O W E R
A / D
2 4 V
5 5 ( 2 . 1 7 )
90
(3
.5
4)
4 ( 0 . 1 6 )
8 7 ( 3 . 4 3 )
FX
2N
-4
A
D
5 5 ( 2 . 1 7 )
80
(3
.1
5)
I+
V
I-
V
+
I+
V
I-
C
H
4
C
H
3
C
H
2
C
H
1
V
+
I+
V
+
I+
V
+
24
+
24
-
V
I-
V
I-
FG
FG
FG
9 ( 0 . 3 5 )
M o u n t i n g h o l e s
4 . 5 m m ( 0 . 1 8 ) d i a .
D I N r a i l
M o u n t i n g s l o t
3 5 m m ( 1 . 3 8 )
E x t e n s i o n c a b l e
a n d c o n n e c t o r
A / D L E D
2 4 V L E D
T e r m i n a l s c r e w s M 3 ( 0 . 1 2 )
C
H
1
V
+
24
+
24
-
V
I-
4 ( 0 . 1 6 )
Weight : Approx. 0.3 kg (0.66 lbs)
Dimensions : mm (inches)
3. WIRING
!
The analog input is received through a twisted pair
shielded cable. This cable should be wired separately
from power lines or any other lines which may induce
electrical noise.
"
If a voltage ripple occurs during input, or there is
electrically induced noise on the external wiring,
connect a smoothing capacitor of 0.1 to 0.47
µ
F, 25V.
#
If you are using current input, connect the V+ and I+
terminals to each other.
$
If there is excessive electrical noise, connect the FG
(frame ground) terminal with the grounded terminal on
the FX
2N
-4AD. (In CH1, there is no FG terminal. Use
FG terminal of other channels.)
%
Connect the ground terminal on the FX
2N
-4AD unit
with the grounded terminal on the main unit. Use
grounding on the main unit, if available.
4. CONNECTION WITH PLC
1) Up to 4 FX
2N
-4AD units can connect to the FX
0N
series PLC, up to 5 for FX
1N
, up to 8 for FX
2N
or, up
to 4 for an 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 I/O points or less. Current consumption
available for the undermentioned special function blocks
≤
190mA
FX
2N
:
Main unit and powered extension units of 48 I/O points or more. Current consumption
available for the undermentioned special function blocks
≤
300mA
FX
2NC
: Up to 4 undermentioned special function blocks can be connected regardless of the system
I/O.
When using an FX
2NC
, an FX
2NC
-CNV-IF is required.
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.
2) Each block occupies 8 I/O points (The 8 points can be allocated from either inputs or outputs).
3) FX
2N
-4AD consumes 30mA from the 5V DC bus.
The total 5V consumption of all special function blocks connected to either the FX
2N
or FX
2NC
main
unit or FX
2N
extension unit must not exceed the 5V source capacity of the system.
4) The FX
2N
-4AD and main unit are connected by a cable on the right of the main unit.
5. SPECIFICATIONS
5.1 Environmental specification
5.2 Performance specification and others
Item
Specification
Environmental specifications
Same as those for the main unit
Dielectric withstand voltage
500V AC, 1min (between all terminals and ground)
Item
Specification
Analog circuits
24V DC ± 10%, 55mA
(external power supply from the main unit)
Digital circuits
5V DC, 30mA
(internal power supply from main unit)
Isolation
Photo-coupler isolation between analog and digital circuits.
DC/DC converter isolation of power from the main unit.
No isolation between analog channels.
Number of occupied I/O points
The analog block occupies 8 points.
(can be either inputs or outputs)
PLC
V +
F G
I +
VI-
Voltage input
-10V to +10V
V +
F G
I +
VI-
Current input
-20mA to +20mA
24-
24+
100K
!
100K
!
250
!
250
!
100K
!
100K
!
CH4
CH1
+15V
AG
-15V
AG
CH4
CH1
1
Shielded
2
3
4
5
1
Shielded
Grounding
(100
!
or less)
Extension cable
FX
2N
-4AD
Analog Input Block
DC24V 55mA
DC/DC
converter
5.3 Performance specification
Analog Inputs
Analog Inputs continued...
NOTE: Preset ranges are selected by an appropriate setting in the buffer memory of the analog block.
Current/Voltage input selection must match the correct input terminal connections.
6. ALLOCATION OF BUFFER MEMORIES (BFM#)
6.1 Buffer memories
Item
Voltage input
Current input
Either voltage or current input can be selected with your choice of input terminal.
Up to four input points can be used at one time.
Analog input
range
DC -10V to +10V
(input resistance: 200k
Ω
).
Warning: this unit may be damaged by an
input voltage in excess of ± 15V.
DC -20mA to +20mA
(input resistance: 250
Ω
).
Warning: this unit may be damaged by an
input currents in excess of ± 32mA.
Digital output
12-bit conversion stored in 16-bit 2’s complement form.
Maximum value: +2047 Minimum value: -2048
Resolution
5mV (10V default range 1/2000)
20
µ
A (20mA default range 1/1000)
Overall
accuracy
± 1% (for the range of -10V to +10V)
± 1% (for the range of -20mA to +20mA)
Conversion
speed
15ms/channel (Normal speed), 6ms/channel (High speed)
Preset 0 (-10V to +10V)
Preset 1 (+4mA to +20mA)
Preset 2 (-20mA to +20mA)
BFM
Contents
*#0
Channel selection Default = H0000
*#1
Channel 1
Contains the number of samples (1 to 4096) to be used for an
averaged result.
The default setting is 8- normal speed. High speed operation
can be selected with a value of 1.
*#2
Channel 2
*#3
Channel 3
*#4
Channel 4
#5
Channel 1
These buffer memories contain the averaged input values for
the number of samples entered for the channel in buffer
memories #1 to #4 respectively.
#6
Channel 2
#7
Channel 3
#8
Channel 4
#9
Channel 1
These buffer memories contain the present value currently
being read by each input channel.
#10
Channel 2
#11
Channel 3
#12
Channel 4
#13 - #14
Reserved
#15
Selection of A/D
conversion speed
see note 2
When set to 0, a normal speed is selected of 15ms/ch (default)
When set to 1, a high speed is selected of 6ms/ch
#16 - #19
Reserved
*#20
Reset to Defaults and Preset.
Default = 0
*#21
Offset, Gain Adjust Prohibit.
Default = (0, 1) Permit
*#22
Offset, Gain Adjust
b7
b6
b5
b4
b3
b2
b1
b0
G4
O4 G3
O3
G2 O2
G1
O1
*#23
Offset Value
Default = 0
*#24
Gain Value
Default = 5,000
#25 - #28
Reserved
#29
Error status
#30
Identification code K2010
#31
Cannot be used
Voltage input
Digital output
-2,000
-2,048
-10.240V
+2,000
+2,047
+
10.235V
+10V
-10V
+1,750
+1,000
Current input
Digital
output
+
32mA
+20mA
+4mA
0
Current input
Digital
output
-1,000
-1,600
-32mA
+1,000
+1,600
+
32mA
+20mA
-20mA
Industrial automation
Elincom Group
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