RT8CN

RT8CN
0–45° to 0–200 Turns • CANbus J1939
Industrial Grade Rotational Position Sensor
Absolute Rotary Position up to 200 turns
Aluminum or Stainless Steel Enclosure Options
IP68 / NEMA 6
GENERAL
Full Stroke Range Options
0-0.125 to 0-200 turns
Electrial Interface
CANbus SAE J1939
Protocol
Proprietary B
Accuracy
see ordering information
Repeatability
± 0.05% full stroke
Resolution
essentially infinite
Enclosure Material Options powder-painted aluminum or stainless steel
Sensor
plastic-hybrid precision potentiometer
Potentiometer Cycle Life Shaft Loading
see ordering information
up to 10 lbs. radial and 5 lbs. axial
Starting Torque (25ºC)
2.0 in-oz., max.
Weight, Aluminum (Stainless Steel) Enclosure
3 lbs. (6 lbs.) max.
ELECTRICAL
Input Voltage
see ordering information
Input Voltage
7 - 18 VDC
Input Current
60 mA max.
Address Setting (Node ID)
Baud Rate
Update Rate
2.5” [64 mm]
4.0” [102 mm]
Our model RT8CN communicates rotational position feedback to your PLC via the CANbus SAE J1939 interface. The
heart of this sensor is a precision plastic-hybrid position potentiometer which provides a “absolute” position and does
not ever have to be reset to a “home” position after a power
loss or planned shutdown.
This innovative sensor is designed to meet tough NEMA-4
and IP67 environmental standards and is available in fullstroke measurement ranges of 1/8 to 200 turns.
0...63 set via DIP Switches
125K, 250K or 500K set via DIP Switches
10 ms. (20 ms. available–contact factory)
Thermal Effects, Span
0.01% f.s./ºF, max.
Output Signal:
FF
...FF
ENVIRONMENTAL
Enclosure
Operating Temperature
Vibration
NEMA 4/4X/6, IP 67/68
-40° to 200°F (-40° to 90°C)
up to 10 g to 2000 Hz maximum
...
0
000
(0% fs.)
(100% fs.)
20630 Plummer Street • Chatsworth, CA 91311
tel: 800.423.5483 • +1.818.701.2750 • fax: +1.818.701.2799
meas-spec.com
RT8CN | 1
Outline Drawing:
2.63 [66,8]
5.41 [137,4]
Ø 2.49 [63,2]
2.49 [63,2]
2
2
30º
1.25 [31,8]
1
4.04 [102.6]
0.38 [9,7]
.25-inch shaft option
+.0000
Ø .2497 in.
-.0003
1 mounting holes:
1.00 [25,4]
0.250 [6,35]
6mm shaft option
for .25 in. shaft option, mounting holes are threaded
#10-32 x 0.375 deep 120° apart on a 2.00 inch dia. BC
+.000
Ø 5.995 mm
-.025
Shaft Detail
for 6mm shaft option, mounting holes are threaded M6
x 9 mm deep 120º apart on a 50,8 mm dia. BC
0.92 [23,4]
2 reference mark:
full counter-clockwise position - align mark on shaft to mark
on face for start of measurement range
DIMENSIONS ARE IN INCHES [MM]
tolerances are ±0.02 in. [±0,5 mm] unless otherwise noted
Ordering Information:
Sample Model Number:
Model Number:
RT8CN - 100 - AL - 25 - FL - J - 500 - 32 - SC5
RT8CN -
R
order code:
Full Stroke Range:
R order code:
clockwise shaft rotations, min:
accuracy (% of f.s.):
potentiometer cycle life*:
R order code:
clockwise shaft rotations, min:
accuracy (% of f.s.):
potentiometer cycle life*:
-
A
B
C
-
J
D
E
-
F
R
A
B
C
D
E
F
G
G
range:
enclosure:
shaft:
mounting style:
interface:
baud rate:
node ID:
electrical connection:
100 turns
powder-painted aluminum
.25-in diameter
flange
CANbus SAE J1939
500 k bits/sec.
32
5-meter cordset with straight plug
R125
R25
R50
1
2
3
5
10
20
0.125
1.25%
0.25
1.25%
0.50
0.5%
1
0.5%
2
0.5%
5
0.2%
10
0.15%
20
0.15%
2.5 x 106
2.5 x 106
2.5 x 106
2.5 x 106
2.5 x 106
3
0.2%
5 x 105
5 x 105
2.5 x 105
2.5 x 105
30
40
50
80
100
120
140
180
200
30
0.15%
40
0.15%
50
0.15%
80
0.15%
100
0.15%
120
0.15%
140
0.15%
180
0.15%
200
0.15%
2.5 x 105
2.5 x 105
2.5 x 105
2.5 x 105
2.5 x 105
2.5 x 105
2.5 x 105
2.5 x 105
2.5 x 105
*–number of times the sensor shaft can be cycled back and forth from beginning to end and back to the beginning before any measurable signal degradation may occur.
Enclosure Material:
AL
SS
powder-painted aluminum
303 stainless steel
A order code:
Shaft Diameter:
B order code:
25
6
25F
6F
0.25-in. diameter
6 mm diameter
0.25-in. dia. w/flats
6 mm dia. w/flats
.2497 in. (+.0000 –.0003)
5.995 mm (+.000 –.025)
0.33 in.
0.025 in.
8.4 mm
0.64 mm
tel: 800.423.5483 • +1.818.701.2750 • fax: +1.818.701.2799
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2 | RT8CN
Ordering Information (cont.):
Mounting Style:
C order code:
FA
FM
face mount
flange mount
Ø 4.1 [104.14]
mounting holes spaced 120º
apart on 2.00 [50,8] BC
.28 [7,1] wide
mounting slot on a
Ø3.50 [88,9] BC
6mm shaft option
threaded M6 x 9 mm deep
30º
.25 in. shaft option
#10-32 x 0.375 inch deep
1.38 [35,1]
Baud Rate:
Node ID:
IN [MM]
1.00 [25,4]
125
250
500
125 kbaud
250 kbaud
500 kbaud
E order code:
0
F order code:
1
2
...
62
63
select address (0 - 63 Decimal)
Electrical Connection:
blank
MC5
SC5
NC5
5-pin micro-connector
(no mating plug supplied)
5-pin micro-connector
w/ mating plug
5-pin micro-connector
and 5 meter length cordset
w/straight mating plug
5-pin micro-connector
and 5 meter length cordset
w/90º mating plug
G order code:
#2 V+
#3 V–
#1 Drain
#5 CAN-L
#4 CAN-H
connector
(contact view)
0.16" - 0.32" OD Cable (THIN)
mating plug
(contact view)
length: 16ft [5M]
cable: Thin
2
1
3
5
pin
1
2
3
4
5
signal
drain
V+
VCan-H
Can-L
length: 16ft [5M]
cable: Thin
wire color
brown
white
blue
black
grey
4
tel: 800.423.5483 • +1.818.701.2750 • fax: +1.818.701.2799
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RT8CN | 3
1 bit
29 bits
0-8 bytes
1 bit 6 bits
15 bits
1 bit 1 bit 1 bit
Inte
rfram
e Sp
ace
Fram
e
End
of
CRC
Delim
iter
Ack
Slot
Ack
Delim
iter
CRC
Sequ
ence
Field
Data
Cont
rol
RTR
Bit
Field
Iden
tifie
r
Inte
rfram
e Sp
ace
Start
of Fra
me
I/O Format and Settings
7 bits
3 bits
repetition = 8 msec.
• Identifier
Message Priority
J1939 Reference
Proprietary B
Future
Use
Data Field Type*
Not Used
1
0
0
0
0
1
1
1
1
1
1
1
1
0
1
0
1
0
0
1
1
0
0
1
1
1
1
1
1
Identifier Bit No. –
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
Hex Value –
F
F
5
3
3
• Data Field
Velocity Data
B0 = LSB current % of measurement range byte
B1 = MSB current % of measurement range byte
B4 = error flag
B5 = error flag
B2 = LSB current measurement count byte
B3 = MSB current measurement count byte
B6 = LSB velocity data byte
B7 = MSB velocity data byte
B6
B5
B4
B3
B2
B1
B0
B7
B6
B5
F
**Customer defined, set via Dips 1-6. Bit values shown for example only, see Address Setting below.
*Sensor field data can be factory set to customer specific value.
B7
Node ID**
Example –
B4
B3
B7
B2
B1
B6
Error Flags
B5
B4
B7
B0
B6
Current
Measurement
Count
Current % of
Measurement
Range
B3
B1
B5
B2
B4
B3
B2
B1
B0
B0
Current Measurement Count
Current % of Measurement Range
Velocity
The Current Measurement Count (CMC) is the output
data that indicates the present position of the
measuring cable. The CMC is a 16-bit value that
occupies bytes B2 and B3 of the data field. B2 is
the LSB (least significant byte) and B3 is the MSB
(most significant byte).
The Current % of Measurement Range is a 2-byte
value that expresses the current linear position as a
percentage of the entire full stroke range. Resolution
is .1 % of the full stroke measurement range.
Data in bytes B7 - B6 is the change and direction of
the CMC (current measurement count) over a 100
msec time period. This data can then be used to
calculate velocity and direction in a post processing
operation.
The CMC starts at 0x0000 with the shaft in the full
counter-clockwise position (at reference mark) and
continues upward to the end of the stroke range
stopping at 0xFFFF. This holds true for all ranges.
This value starts at 0x0000 at the beginning of the
stroke and ends at 0x03E8.
Example:
If required, the CMC can easily be converted a rotary
measurement expressed in degrees instead of simply
counts.
This is accomplished by first dividing the CMC by
65,535 (total counts over the range) and then
multiplying that value by the FSR:
(
CMC
65,535
)
X FSR
If the full stroke range is 1 turn (360 degrees)
and the current position is 0x0FF2 (4082 Decimal)
then,
4082
65,535
)
Percent
0.0%
0.1%
0.2%
...
100.0%
X 360 degrees = 22.4 degrees
0x7FFF (32767)
“0” counts
(no change)
0xFFFF (65535)
32767 counts
Velocity Calculation
B7
B6
B5
B4
B3
B2
B1
B0
Error Flags
Example:
(
Decimal
0000
0001
0002
...
1000
Velocity
(cts./100 msec.)
– 32767 counts
0x0000 (0)
Hex
0000
0001
0002
...
03E8
Converting CMC to Degrees
max
max
“reverse” “forward”
velocity velocity
B7 - B6
HEX (Decimal)
0x55 (yellow LED on controller board) indicates that
the sensor has begun to travel beyond the calibrated
range of the internal position potentiometer.
0xAA (red LED on controller board) indicates that
the sensor has moved well beyond the calibrated
range of the internal position potentiometer.
If either error flag occurs within the full stroke range
of the sensor, the unit should be returned to the
factory for repair and recalibration.
(
count change – 32767
.1 sec. time period
) (
X
full stroke range
65,535
)
Sample Calculations
Clockwise Shaft Rotation (positive direction):
B7–B6 = 0x89C6 (43462 Dec.), full stroke = 1 Turn
(
) ( )=
35270 - 32767
.1 sec
X
1 Turn
65,535
.38 turns/ sec.
Counter-Clockwise Shaft Rotation (negative direction):
B7–B6 = 0x61A8 (25000 Dec.), full stroke = 1 Turn
(
) ( )=
25000 - 32767
.1 sec
X
1 Turn
65,535
–1.2 turns/ sec.
tel: 800.423.5483 • +1.818.701.2750 • fax: +1.818.701.2799
meas-spec.com
4 | RT8CN
Setting the Address (Node ID) and Baud Rate
Address Setting (Node ID)
Baud Rate
The Address Setting (Node ID) is set via 6
switches located on the 8-pole DIP switch
found on the DeviceNET controller board
located inside the transducer.
The transmission baud rate may be either factory
preset at the time of order or set manually at the
time of installation.
DIP-2
0
1
0
...
1
(20)
(21)
DIP-3 DIP-4
The baud rate can be set using switches 7 & 8 on
the 8-pole DIP switch found on the DeviceNET
controller board located inside the transducer.
DIP-5
DIP-6
0
0
0
...
0
0
0
...
0
0
0
...
address
(decimal)
0
1
2
...
1
1
1
63
(22)
(23)
0
0
1
...
0
0
0
...
1
1
(24)
address / baud rate switches
1 2 3 4 5 6 7 8
The DIP switch settings are binary starting
with switch number 1 (= 20) and ending
with switch number 6 (= 25).
DIP-1
CANBus Controller Board
(25)
DIP-7
0
1
0
1
DIP-8
0
0
1
1
baud rate
125k
250k
500k
125k
internal dip switches
& controller board
= "0"
1 2 3 4 5 6 7 8
= "1"
to gain access to the controller board,
remove four Allen-Head Screws and
separate case halves
version: 10.0 last updated: February 28, 2014
tel: 800.423.5483 • +1.818.701.2750 • fax: +1.818.701.2799
meas-spec.com
RT8CN | 5