Mitsubishi Electric MELSEC FX-1HC User Manual

FX-1HC

SPECIAL FUNCTION BLOCK

USER'S GUIDE

JY992D53001A

This manual contains text, diagrams and explanations which will guide the reader in the correct installation
and operation of the FX-1HC 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 PROGRAMMING MANUAL and FX SERIES HARDWARE
MANUAL.

1

●

The FX-1HC hardware high-speed counter block is 2-phase 50 kHz high-speed counter. It is a special
function block for the FX, FX

2C series PC. The FX-1HC counts at a higher speed than the built-in high-

INTRODUCTION

speed counter of the PC (2-phase 2 kHz, 1-phase 10 kHz) and performs comparisons and outputs
directly.

●

Various counter modes, such as 1-phase or 2-phase, 16-bit or 32-bit modes, can be selected using
commands from the PC. Allow the FX-1HC unit to run only after setting these mode parameters.

●

The source of your input signal should be a 1 or 2 phase encoder. A 5V, 12V, or 24V power source can
be used. An initial value setting command input (PRESET) and a count prohibit command input (DISABLE)
are also available.

●

The FX-1HC has two output. When the counter value coincides with an output compare value, the
appropriate output is set ON. A PNP and an NPN output transistor is provided for both outputs to allow
either sink or source connection methods.

●

FX PCs versions 2.0 or later (those with serial number 13XXXX or larger) are required as these units have
the TO/FROM applied instructions in their instruction set. Data transfer between the FX-1HC and the FX PC
is by buffer memory exchange. There are 32 buffer memories (each of 16 bits) in the FX-1HC.

●

The FX-1HC occupies 8 points of I/O on the FX or FX2C expansion bus. The 8 points can be allocated
from either inputs or outputs.

1.1 External dimensions

weight : Approx 0.5 kg (1.1 lbs) Dimensions : mm (inches)
Accessories : Self-adhesive labels special block number identification.

567

4

3

2
1

DISABLE terminal (M3.5 (0.14) screws)
YH•YS terminal (M3.5 (0.14) screws)
Extension cable and connector
POWER LED
φA,φB terminal (M3.5 (0.14) screws)
PRESET terminal (M3.5 (0.14) screws)
UP LED

φA LED
φB LED

8

12

9

10
11

125 (4.92)

140 (5.51)

13

15
16

63 (2.48)

73 (2.87) 14

17

10 (0.39)

95 (3.74)

DN (Down) LED
PRESET LED
Mounting hole 2- φ5.5 (0.22)
Attachment groove for 3.5 (1.38) wide DIN rail
DIN rail clip
DIS (DISABLE) LED
YH LED
YS LED

2

Encoder

Phase A

Phase B

Phase Z

+24V COM

NPN output encoders can also be used.

Shielding wire

OUT

COM

E

OUT

COM

E

OUT

COM

E

START

φA

φB

PRESET

DISABLE

Shielding wire

Shielding wire

Shielding wire

Wiring

φA24
φA12
φA5

COMA

φB24
φB12
φB5

COMB

XP24

COMP

XD24

COMD

12 to 24V inputtable

XP5

XD5

3.3k

1.5k

0.5k

0.1k

1.5k

0.5k

0.1k
12 to 24V
inputtable

DC24V+

*1

YHP

*1

YHN

DC24-

DC24V+

*1

YSP

*1

YSN

DC24-

*2

+24V 0V

External power source
DC5V, 12V, 24V

〈〈

〈Using the solderless termination

〈〈

6.8 mm

(0.27 inches)

or less

6.8 mm

(0.27 inches)

or less

Class 3

grounding

(<100 Ω)

For

M3.5

(0.14

inches

PC

●

●

)

●

Extension

〉〉

〉

〉〉

SG

FX-1HC

cable

*1. Do not connect YHP and

YHN, or YSP and YSN
together.

*2. Connect SG and the gro-

unded terminal at the PC
side as required.

External power source
DC12 to 24V

+24V0V

Use crimp terminals of the dimensions specified in the left figure.
Secure the terminals using a tightening torque of 0.5 to 0.8 N•m (5

to 8 kg•cm).
Wire only to the module terminals discussed in this manual. Leave

all thers vacant.

3

SPECIFICATIONS

3.1 Environmental specifications

The environmental specifications for the FX-1HC are the same as those for your FX series PC.

3.2 Performance specifications

Input signal

Counting

specifi-

cation

Item

Signal level

MAX. frequency

Pulse shape

Format

Range

Comparison Type

1-phase input

1 input 2 inputs

5V, 12V, or 24V ±10% (selected by terminal connection) 7mA

50 kHz

t1 t1

t2

t3

t3

Automatic UP/DOWN (however, when on 1 phase 1 input mode, UP/DOWN is
determined by a PC command or an input terminal.)
When 32-bit is specified: -2,147,483,648 to +2,147,483,647
When 16-bit is specified: 0 to 65,535 (upper limit can be user specified)
Each output is set when the present value of the counter matches with the compare

value (which is transferred from the PC), and is switched OFF by a reset command
from the PC.

: Direct output processed by hardware.

YH
YS

: Software processed output with worst delay time of 300µs.

(Therefore, when the input frequency is 50 kHz, there is a worst case delay of 15 input
pulses.)

t2

1 edge count

t1 : Rise/fall time is 3µs or less
t2 : ON/OFF pulse duration 10µs or more
t3 : Phase difference between phase A and phase B

is 3.5µs or more
PRESET (Z phase) input 100µs or more
DISABLE (count prohibit) input 100µs or more

2-phase input

4 edge count2 edge count

25 kHz 12.5 kHz

YHN

Output

signal

Power from base

Types of outputs

Output capacity

I/O occupation

YHP
YSN
YSP

DC 12V to 24V 0.5A
8 point taken from the FX, FX2C expansion bus (can be either inputs or outputs)
DC 5V 70mA

: NPN transistor output for YH output
: PNP transistor output for YH output
: NPN transistor output for YH output
: PNP transistor output for YH output

PNP

+

Output

NPN

Output

–

3.3 Buffer memories (BFM)

BFM number

#0
#1

#3, #2

Write

Write / Read

Read

#5~#9, #16~19, #28, #31 are reserved.

#4
#11, #10
#13, #12
#15, #14
#21, #20
#23, #22
#25, #24

#26
#27
#29
#30

Counter mode K0 to K11
DOWN/UP command (1-phase 1-input mode)
Ring length Upper/Lower
Command
Preset data Upper/Lower
YH compare value Upper/Lower
YS compare value Upper/Lower
Counter current value Upper/Lower
Maximum count value Upper/Lower
Minimum count value Upper/Lower
Compare results
Terminal status
Error status
Model identification code K4010

Contents

Default: K0
Default: K0
Default: K65,536
Default: K0
Default: K0
Default: K32,767
Default: K32,767
Default: K0
Default: K0
Default: K0

(1) BFM #0 Counter mode (K0 to K11), BFM #1 DOWN/UP command

Count modes

2-phase input

(phase difference pulse)

1-phase 2-input (add/subtract pulse)

1-phase 1-input

32-bit counter modes

(a)

1 edge count
2 edge count
4 edge count

Hardware

UP/DOWN

Software

UP/DOWN

32 bits

K0
K2
K4
K6

K8

K10

16 bits

K1
K3
K5
K7

K9

K11

The counter mode is selected form the PC. As
shown below, values between K0 and K11 are
written to buffer memory BFM #0 form the PC.
When a value is written to BFM #0 the contents
of BFM #1 to BFM #31 are reset to default values.
When setting this value use a TOP (pulsed)
instruction use M8002 (initial pulse) to drive the
TO instruction.
A continuous command is not allowed.

A 32-bit binary counter which executes UP/DOWN counting will change
from the lower limit to the upper limit or the upper limit to the lower limit
when overflow occurs. Both the upper and lower limits are fixed values:
the upper limit is +2,147,483,647, and the lower limit is -2,147,483,648.

16-bit counter modes

(b)

A 16-bit binary counter handles only positive values from 0 to 65,535.
Changes to zero from the upper limit or to the upper limit from zero when
overflow occurs; the upper limit is determined by BFMs #3 and #2.

+2,147,483,647

Upper limit

Lower limit

-2,147,483,648

Ring length

(BFM #3, #2)

(c)

1-phase 1-input counter (K8 to K11)

●

Hardware UP/DOWN (K8, K9)

●

Software UP/DOWN (K10, K11)

Phase A

OFF ON

ON

Phase B

OFF

Current

UP

value

(d)

1-phase 2-input counter (K6, K7)

Phase
A input

Phase

ON
OFF

ON

B input

OFF

1 2 3 3 3 2 1 0

2-phase counter (K0 to K5)

(e)

●

1 edge-count-counter (K0, K1)

DOWN

UP/DOWN is
determined by
input phase A
(ON/OFF).

Phase A input -1 at
OFF→ON.

Phase B input+1 at
OFF→ON.

BFM #1

Phase B

Current
value

K0 K1

ON

OFF

UP

UP/DOWN is de­termined by the
contents of BFM
#1, (K0/K1).

DOWN

If both phase A and phase B inputs are received
simultaneously, the counter value dose not
change.

●

2 edge-count counter (K2, K3)

Phase A

Phase B

+1 +1 -1

Phase B inputOFF
→ON while phase
A input ON Count
up by 1.

●

4 edge-count counter (K4, K5)

Phase B input ON
→OFF while phase
A input ON Count
down by 1.

Phase A

Phase B

UP COUNT : DOWN COUNT :

Phase A input

Phase B input

+1 +1 +1 +1

Phase A input

Phase B input

+1 +1 -1

Phase B input OFF
→ON while phase
A input ON Count
up by 1.

Phase B input ON
→OFF while phase
A input ON Count
down by 1.

-1

-1 -1

-1

(2) BFM #3, #2 Ring length

Stores the data that specifies the length of the
16-bit counter (default: K65,536).

X002

K1(D) TO K2 K2 K100

In the above example, K100 is written into BFMs
#3 and #2 of special block No.2 as a 32-bit binary

UP

98 99 0 1

DOWN

1 0 99 98

When ring length K100 is specified, the value

of the counter changes as shown above.
value (BFM #3 = 0, BFM #2 = 100). Permitted
values: K2 to K65,536.

Write counter data with(D)TO

●

Count data is always handled as a pair from two 16-bit values in this special function block. 16-bit
2's complement value stored in the registers of the PC cannot be used.

●

When you are writing a positive value between K32,768 and K65,535, the data should be treated
as a 32-bit value even when a 16-bit ring counter is used.

●

When transferring counter data to/from this special function block, always use the 32-bit forms of
the FROM/TO instructions ((D) FROM, (D) TO).

(3) BFM #4 Command

2.

BFM #4
b0
b1
b2
b3
b4
b5 to b7
b8
b9
b10
b11
b12

When b0 is set to ON and the DISABLE input terminal to

1.
OFF, the counter is permitted to start counting input pulses.

When ‘0’ (OFF)

Count prohibit
YH output prohibit
YS output prohibit
YH/YS independent action
Preset prohibit
Undefined
No action
No action
No action
No action
No action

When ‘1’ (ON)

Count permit
YH output permit
YS output permit
Mutual reset action
Preset permit

Error flag reset
YH output reset
YS output reset
YH output set
YS output set

Unless b1 is set to ON, YH (hardware compared
output) dose not turn ON.

3.

Unless b2 is set to ON, YS (software compared
output) dose not turn ON.

4.

When b3 = ON, YS output is reset if YH output is set,
and YH output is reset if YS output is set. When b3 =
OFF, YH and YS output act independently, and do
not reset each other.

5.

When b4 = OFF, preset function by the PRESET
input terminal is disabled.

6.

When b8 is set to ON, all error flags are reset.

7.

When b9 is set to ON, YH output is reset.

8.

When b10 is set to ON, YS output is reset.

9.

When b11 is set to ON, YH output is set ON.

10.

When b12 is set to ON, YS output is set ON.

(4) BFM #11, #10 Preset data

●

Data to used as the initial value when the counter starts to count.

●

Data becomes valid when b4 of BFM #4 is set to ON, and PRESET input terminal changes from OFF to
ON. The default value of the counter is zero. You can change it by writing a value into BFM #11 and #10
or by using the command below.

●

The initial counter value can also be set by writing the data directly into BFM #21 and #20 (current value
of the counter).

(5) BFM #13, #12 Comparison value for YH output, BFM #15, #14 Comparison value for YS output

●

After comparing the current value of the counter with
the value written in BFM #13 and #12, BFM #15 and

Current value Current value

#14, the hardware and software comparator in the FX­1HC outputs the comparison result.

●

YH, YS output will not turn ON if you use PRESET or

Current value Current value

the TO instruction to set the counter value equal to the
comparison value. It will turn ON only when a match
occurs by the counting of input pulses.

●

The YS comparison operation takes about 300µs, and
if a match occurs, the output goes ON.

●

Output occurs when the current value becomes equal

BFM #4

b9, b10

BFM #4

b9, b10

to the compare value but only if b1 and b2 of BFM #4
are ON. Once an output is set, it remains ON until it is

Coincidence output Coincidence output

reset by b9 or b10 of BFM #4. If b3 of BFM #4 is ON,
however, one of the outputs is reset when the other is
set.

(6) Counter current value (BFM #21, 20)

The current value of the counter can be read by the PC. It will not be the correct value during high-speed
operations because of the communication delay. The current value of the counter can be forcibly changed
by writing a 32-bit value into the appropriate BFMs from the PC.

(7) Maximum count value (BFM #23, 22)

These store the maximum and minimum value reached by the counter. If the power is turned off, the
stored data is cleared.

(8) Comparison status (BFM #26)

BFM #26

YHb0b1

b2

When ‘0’ (OFF)

Set value ≤ current value
Set value ≠ current value
Set value ≥ current value

When ‘1’ (ON)

Set value > current value
Set value = current value
Set value < current value

BFM #26

YSb3b4

b5

When ‘0’ (OFF)

Set value ≤ current value
Set value ≠ current value
Set value ≥ current value

When ‘1’ (ON)

Set value > current value
Set value = current value
Set value < current value

BFM #26 is for reading only. Write commands from the programmable controller are ignored.

(9) Terminal status (BFM #27)

BFM #27

b0
b1

When ‘0’ (OFF)

PRESET input is OFF.
DISABLE input is OFF.

When ‘1’ (ON)

PRESET input is ON.
DISABLE input is ON.

BFM #27

b2
b3

b4 to b15

When ‘0’ (OFF)

YH output is OFF.

YS output is OFF.

Undefined

When ‘1’ (ON)

YH output is ON.
YS output is ON.

(10) BFM #29 Error status

Error status in the FX-1HC can be checked by reading the contents of b0 to b7 of BFM #29 to auxiliary
relays of the PC.

Error status

Set when any of b1 to b7 is ON.
Set when the value of the ring length is written incorrectly (other than K2 to K65,536).
Set when the preset value is written incorrectly.
Set when the compare value is written incorrectly.
Set when the current value is written incorrectly.
Set when the counter overflows the upper limit.
Set when the counter overflows the lower limit.

When the upper or lower limit is exceeded on a 32­bit counter.

When value ≥ ring length in 16-bit counter mode.

Set when the FROM/TO command is used incorrectly.

Undefined

There error flags can be reset by b8 of BFM #4.

(11) Model identification code number BFM #30

The identification number for a Special Function Block is read by using the FROM command.
The identification number for the FX-1HC unit is K4010.

By reading this identification number, the user may create built-in checking routines to check whether the
physical position of the FX-1HC matches to that of the software.

BFM #29

b0
b1
b2
b3
b4
b5
b6
b7

b8 ~ b15

4

EXAMPLE PROGRAM

Please use the following program as a guide whenever you use the FX-1HC unit. Other instructions to
read the current value of the counter, status etc. can be added as required.

M8002

Initial
pulse

X014

M8002

X010

M8000

X011

X012

X013

M8000

RUN

monitor

(D) TO

TO

(D) TO

(D) TO

M10

M11

M14

PLS

PLS

TO

(D)FROM

K2 K0 K11 K1TO

K2

K2

K2

K2

M18

M19 and M20

K2

K2

K2

K1

K12

K14

M13

K4

K20

K1234

K1

K1000

K900

Count allowed
Output allowed

Mutual reset
Preset allowed

Error flag reset

YH YS output reset

K4M10D2K1

K1

K1

K1

K1

K1

1.

K11 is written into BFM #0 of special function block
No.2. The counter input is 16-bit 1-phase. Please
use a pulse command for this initialization.

2.

K1234→ BFM #3, #2 (special function block No.2)

The ring length can be specified when a
16-bit counter is specified.

3.

UP/DOWN direction should be specified for 1­phase 1-input software determined UP/DOWN
counter.

4.

K1000→ BFM #13, #12 Set the compare value

for YH output.

5.

K900 → BFM #15, #14 Set the compare value

for YS output (not necessary if only YH
output is used).

Note that counting only occurs if count prohibit is

6.
OFF. Also, outputs will not be set from the counting
process at all if the relevant output prohibit are set
in the command register. Please reset the error
flags and YH/YS output before you start. The
mutual reset and preset initialization commands
can be used as required.

(M25 to M10) → BFM #4 (b15 to b0) command7.

8. BFM (#21, #20)→ Reads the current value to the

data registers D3 and D2.

5

5.1 Preliminary checks

(1) Check that the I/O wiring and extension cable of the FX-1HC are properly connected.
(2) 5V 70mA power is supplied from the base or extension units for the FX-1HC. Check that there is no

power overload from this and other extension blocks.

(3) The counter works correctly only when data such as the counter mode (set with a pulse command), the

TO command, the compare value, etc. are appropriately specified. Remember to initialize the count
(BFM #4 b0), preset (BFM #4 b4), and output (BFM #4 b2, b1) prohibits. Reset the YH/YS outputs
before you start.

5.2 Error checking

The following LEDs on the main panel of the FX-1HC may help you to troubleshoot the unit.

●

φA, φB Goes on/off as φA, φB input turn ON/OFF. It can be checked by rotating the encoder slowly.

●

UP, DN Lights up to indicate whether the counter is going up (UP) or down (DN).

●

PRESET and DIS : The appropriate LED lights up when the PRESET terminal or the DISABLE terminal

●

YH, YS The appropriate LED lights up when YH/YS output is turned on.
You can check the error status by reading the content of BFM #29 to the PC. Error contents are shown in
section 3.3 (10).

:
:

is ON.

:

DAIGNOSTICS

6

SYSTEM BLOCK DIAGRAM

Counter mode BFM #0

TO

Ring upper limit value
BFM #3, #2

DOWN/UP command
BFM #1

φB
φA

DISABLE

φZ

PRESET

TO

Preset data
BFM #11, #10

TO

BFM #4 b0

Direct initialization

Count pulse

BFM #4 b4

Count start

Initiali-

zation

16-bit
counter

1-phase
1-input
counter

DOWN/UP

Counter
16/32-bit
1-phase/
2-phase

Current value
register
BFM #21, #20

Error status
BFM #29

for YH output

Comparisor

TO

data
BFM #13, #12

for YS output

Comparison

TO

data
BFM #15, #14

*1

Sampling cycle
300µs

Reset
BFM #4 b8

Matched

Matched

BFM #4 b1

BFM #4 b2

BFM
#4 b11

BFM #4 b9

BFM
#4 b12

BFM #4 b10

S
R

BFM #4 b3

S
R

YH

YS

Maximum
value
BFM #23, #22

Minimum
Model code
BFM #30

value

BFM #25, #24

Compare
results
BFM #26

Terminal
status
BFM #27

*1. Comparison is made at

the next sampling point
after an input count.

Guidelines for the safety of the user and protection of
the FX-1HC special function block

●

This manual has been written to be used by trained and competent personnel. This is defined
by the European directives for machinery, low voltage and EMC.

●

If in doubt at any stage during the installation of the FX-1HC always consult a professional
electrical engineer who is qualified and trained to the local and national standards. If in doubt
about the operation or use of the FX-1HC please consult the nearest Mitsubishi Electric distributor.

●

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 actual
use of the product based on these illustrative examples.

JY992D53001A

Manual number : JY992D53001
Manual revision : A
Data : Febrary 1996

HEAD OFFICE : MITSUBISHI DENKI BLDG MARUNOUCH TOKYO 100 TELEX : J24532 CABLE MELCO TOKYO
HIMEJI WORKS : 840, CHIYODA CHO, HIMEJI, JAPAN

Effective FEB. 1996
Specifications are subject
to change without notice.