Installation Instructions
(Catalog Number 1771-IR Series C)
Contents
This icon is used when
additional information is
available in the RTD Input
Module User Manual,
publication 1771-6.5.76.
If you need a copy of this
manual, fax the enclosed User
Manual Request Card to
1-800-576-6340. If you are
outside the U.S., fax the card to
1-330-723-4036.
Prevent Electrostatic
Discharge
Use this document as a guide when installing the 1771-IR/C
input module.
To See page
Prevent Electrostatic Discharge Below
Understand Compliance to European Union Directives 1
Understand Product Compatibility 2
Calculate Power Requirements 2
Determine Module Placement 3
Key the Backplane Connector 3
Install the Module and Field Wiring Arm 4
Connect Wiring to the Field Wiring Arm 5
Ground the Chassis and Module 6
Configure the Module 7
For this reference information See page
Status Indicators 9
Troubleshooting 9
Specifications 11
Differences Between Series 12
The RTD input module is sensitive to electrostatic discharge.
ATTENTION: Electrostatic discharge can damage
integrated circuits or semiconductors if you touch
!
backplane connector pins. Follow these guidelines
when you handle the module:
• Touch a grounded object to discharge static potential
• Wear an approved wrist-strap grounding device
• Do not touch the backplane connector or
connector pins
• Do not touch circuit components inside the module
• If available, use a static-safe work station
• When not in use, keep the module in its
static-shield bag
Understand Compliance to
European Union Directives
This product has the CE mark and is approved for installation within
the European Union and EEA regions. It has been designed and
tested to meet the following directives.
Publication 1771-5.50 – October 1996
RTD Input Module2
Nbe
I
e
I
e
Block
Block
C
EMC Directive
This product is tested to meet Council Directive 89/336/EEC
Electromagnetic Compatibility (EMC) and the following standards,
in whole or in part, documented in a technical construction file:
• EN 50081-2EMC – Generic Emission Standard,
Part 2 – Industrial Environment
• EN 50082-2EMC – Generic Immunity Standard,
Part 2 – Industrial Environment
This product is intended for use in an industrial environment.
Low Voltage Directive
This product is tested to meet Council Directive 73/23/EEC
Low Voltage, by applying the safety requirements of EN 61131–2
Programmable Controllers, Part 2 – Equipment Requirements and
Tests.
For specific information required by EN 61131-2, see the appropriate
sections in this publication, as well as these Allen-Bradley
publications:
Understand Product
Compatibility
Calculate Power
Requirements
Publication Publication number
Industrial Automation Wiring and Grounding Guidelines
For Noise Immunity
Guidelines for Handling Lithium Batteries AG-5.4
Automation Systems Catalog B111
1770-4.1
The 1771-IR/C module can be used with any 1771 I/O chassis.
Compatibility and data table use is listed below.
Use of Data Table Compatibility
Catalog
Number
1771-IR/C 8 8 8/9 14/15 Yes Yes Yes A, B
A
= Compatible with 1771-A1, -A2, -A4 chassis.
B = Compatible with 1771-A1B, -A2B, -A3B, -A4B chassis.
Y
es = Compatible without restriction.
No = Restricted to complementary module placement.
Input
mag
Bits
Output
mag
Bits
Read
Words
Write
Words
Addressing
1/2-Slot 1-Slot 2-Slot
Chassis
Series
The module receives its power through the 1771 I/O power supply.
The maximum current drawn by the RTD module is 950mA
(4.75 Watts).
Publication
Add this current to the requirements of all other modules in the I/O
chassis to prevent overloading the chassis backplane and/or
backplane power supply.
1771-5.50 – October 1996
RTD Input Module 3
Key
Determine Module
Placement in the I/O
Chassis
You can place your module in any I/O module slot of the I/O chassis
except for the extreme left slot. This slot is reserved for PC
processors or adapter modules.
Group your modules to minimize adverse affects from radiated
electrical noise and heat. We recommend the following.
• Group analog input and low voltage dc modules away from ac
• Do not place this module in the same I/O group with a discrete
the Backplane Connector
Place your module in any slot in the chassis
except the leftmost slot which is reserved for
processors or adapters.
ATTENTION: Do not insert or remove modules from
the I/O chassis while system power is ON. Failure to
!
modules or high voltage dc modules to minimize electrical noise
interference.
high-density I/O module when using 2-slot addressing. This
module uses a byte in both the input and output image tables for
block transfer.
observe this rule could result in damage to module
circuitry.
Position the keying bands in the backplane connectors to correspond to
the key slots on the module.
Place the keying bands:
between 10 and 12
28
between
and 30
ATTENTION: Observe the
following precautions when
!
inserting or removing keys:
• insert or remove keys with
your fingers
Upper
Connector
• make sure that key placement
is correct
Incorrect keying or the use of a tool
can result in damage to the
backplane connector and possible
system faults.
I/O chassis
11022-I
You can change the position of these bands if subsequent system design
and rewiring makes insertion of a different type of module necessary
.
Publication
1771-5.50 – October 1996
RTD Input Module4
Install the Module and
Field Wiring Arm
!
Place the module in the card guides on the top and bottom of the chassis that guide the module into position.
1
Important:
Apply firm even pressure on the module to seat it into its backplane connector.
ATTENTION: Remove power from the 1771 I/O
chassis backplane before you install the module.
Failure to remove power from the backplane
could cause:
• module damage
• degradation of performance
• injury or equipment damage due to possible
unexpected operation
1771-A1B, -A2B, -A3B, -A4B I/O chassis
Snap the chassis latch over the
top of the module to secure it.
Attach the wiring arm (1771-WF) to the horizontal bar at the
2
bottom of the I/O chassis.
The wiring arm pivots upward and connects with the
module so you can install or remove the module without
disconnecting the wires.
1771-A1B, -A2B, -A4B Series B I/O chassis
Swing the chassis locking bar
down into place to secure the
modules. Make sure the locking
pins engage.
1771-WF
Publication
1771-5.50 – October 1996
RTD Input Module 5
Connect Wiring to the
Field Wiring Arm
Channel Terminal
1 18 C
2 15 C
3 12 C
4 9 C
5 6 C
6 3 C
Identification
17 B
16 A
14 B
13 A
11 B
10 A
8 B
7 A
5 B
4 A
2 B
1 A
Connect your I/O devices to the field wiring arm (cat. no. 1771-WF)
shipped with the module.
ATTENTION: Remove power from the 1771 I/O
chassis backplane and field wiring arm before
!
removing or installing an I/O module.
• Failure to remove power from the backplane or
wiring arm could cause module damage, degradation
of performance, or injury.
• Failure to remove power from the backplane could
cause injury or equipment damage due to possible
unexpected operation.
Connection Diagram for the RTD Input Module (1771-IR/C)
(Channel 1 shown)
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Field Wiring Arm
Cat. No. 1771-WF
Chassis
Ground
RTD
11846-I
Publication
1771-5.50 – October 1996
RTD Input Module6
Ground the Chassis and Module
Use the following diagrams to ground your
I/O chassis and input module. Follow these
steps to prepare the cable:
Remove a length of cable
jacket from the Belden 8761 cable.
1
Belden
8761 Cable
Pull the foil shield and bare
2
drain wire from the insulated wires.
Bare drain
wire
Insulated
wires
Foil
shield
Chassis Ground
When you connect grounding conductors to the I/O chassis
grounding stud, place a star washer under the first lug, then
place a nut with captive lock washer on top of each ground lug.
Ground Lug
Nut
Nut and Captive
Washer
Grounding Stud
I/O Chassis
Side Plate
1
Use
the cup washer if crimp-on lugs are not used.
Single-point Grounding
Star
Washer
Ground Lug
Shield and Drain
twisted together
1
Twist the foil shield and drain
wire together to form a single strand.
3
Attach a ground lug.
4
When using shielded cable wire, ground the foil
shield and drain wire only at one end of the cable.
We recommend that you wrap the foil shield and
drain wire together and connect them to a chassis
mounting bolt.
At the opposite end of the cable, tape exposed
shield and drain wire with electrical tape to insulate
it from electrical contact.
Refer to Wiring and Grounding Guidelines,
publication 1770-4.1 for additional
information.
Extend shield to termination point.
Expose just enough cable to adequately
terminate inner conductors.
Use heat shrink tubing
or other suitable
insulation where wire
exits cable jacket.
Shield and Drain
twisted together
#10 Thread-forming screw
External-tooth
Washers
Publication
1771-5.50 – October 1996
RTD Input Module 7
De
Configure the Module
Use the configuration information below to configure your module
to your specifications.
For detailed configuration
information, see chapter 5 of your
RTD Input Module User Manual
(publication 1771-6.5.76).
Dec. Bits 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Octal Bits 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Real T
Word
1
No RTS (50ms)
0.1s
0.2s
0.3s
0.4s
0.5s
0.6s
0.7s
0.8s
0.9s
1.0s
1.5s
2.0s
2.5s
3.0s
3.1s
ime Sampling -
default = no R
0
0
0
0
TS
0
0
0
0
000 01
0
0011
0
0
1
0
0
0
1
0
0
0
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
1
111
1
1
1
1
0
0
0
0
1
0
1
1
1
0
0
0
1
1
1
Important: Use decimally addressed bit
locations for PLC-5 processors.
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Data
Format
RTD
Type
Units of
Measure
Single channel in ohms
In temperature mode:
0 = Entire module is platinum
1 = Entire module is 10 ohm copper.
Enter exact value in word 2.
In ohms mode:
0 = 30mohm/count resolution
1 = 10mohm/count resolution
Set to match your
Bit 10 Bit 09
0
0
1
1
processor.
BCD (default)
0
Reserved
1
Two’s complement binary
0
Signed magnitude binary
1
If any of these bits are set, the corresponding input
channel will be reported in ohms. If RTDs other than 10
ohm copper or 100 ohm platinum are used you must
report those channels in ohms, not degrees. Data format
on a channel displayed in ohms will default to binary.
scription
Real time sampling, data format, R
type units of measure, and single
channel in ohms
TD
Determines what units of measure
the module reports.
Units of measure
Degrees C
Degrees F
Ohms
Not used
Bit 07 Bit 06
00
01
10
11
2
3, 4, 5, 6, 7, 8
9, 10, 11, 12, 13,
14, 15
15
If
bit 10 is set in word 1, and temperature readings are desired, word 2 must also be used. Enter
the exact resistance of 10 ohm RTD at 25oC in BCD. Range is 9.00 to 1
than 9.00 ohms or greater than 1
default to 10.00 ohms.
Individual channel bias
BTR. The bias value is always a positive number. Bias value range is 0<
Not used
Channel failed calibration
1.00 ohms will default to 10.00 ohms. Non–BCD values will also
- entered in BCD. This value is subtracted from the channel data in the
Channel 1-6 calibration
FC EE
1.00 ohms. V
bias<9999.
Not used
alues less
S G O
Faulty calibration (no save)
EEPROM fault
10 ohm resistance @ 25
Channel 1-6 bias
Individual channel calibration
auto-calibration request word
Offset calibration complete
Gain calibration complete
Save complete
Publication
1771-5.50 – October 1996
_C
RTD Input Module8
De
Use the following table to read data from your input module.
Dec. Bits 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Octal Bits 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
Word
1
RTS
Channel overrange
EE PU
Channel underrange
Underrange bits for each channel; set when
Real time sample fault bit – (RTS) Real
time sample time-out bit.
Overrange bits for each channel. set when the input is
above the normal operating range. Bit 10 for input 1, bit
11 for input 2, etc.
input is below the normal operating range for
copper or platinum RTD. Bit 00 for input 1, bit 01
for input 2, etc.
Power up bit –
but not yet configured.
EEPROM status bit – (EE) This bit is set if EEPROM
values could not be read.
2 Not
3, 4, 5, 6, 7, 8
used
Channel overflow –
Only the remainder is shown in the data word. Bit 00 for input 1, bit 01 for input 2, etc. Default bias is
automatically applied when BCD formatted data cannot be displayed. This will occur when measuring
temperatures in Fahrenheit larger than 999.9 degrees. The default bias value which is subtracted is
1000.0.
Channel Polarity –
corresponds to input 1, bit 11 to input 2, etc. These bits are used for BCD and signed magnitude data
formats.
Channel 1-6 Data –
The data words must be multiplied or divided by a factor if whole numbers need to be displayed. See
table below
.
Channel Polarity
When set, indicate that default bias has been subtracted from the input value.
Sign bits for each channel. When set indicate that a certain input is negative. Bit 10
Input data words for each channel. Word 3 to channel 1, word 4 to channel 2, etc.
Not Used
Channel overflow Channel overflow
If Then
you are reading temperature in oF or oC
you are reading resistance in milliohms (copper
R
TDs) (BTW word 1, bit 10 = 1)
you are reading resistance in milliohms (all
other R
TDs) (BTW word 1, bit 10 = 0)
9
Not used
Channel failed calibration
there is an implied decimal point (XXX.X) after the
least significant digit. Resolution is 0.1o.
there is an implied decimal point (XXX.XX).
multiply the data word by 30 to get the actual value
in milliohms. Resolution is 30 milliohms.
FC EE
Not used
S G O
scription
(PU) Set when the module is alive
, channel polarity
Channel 1-6 Data
Auto-calibration status
Publication
Faulty calibration (no save)
1771-5.50 – October 1996
EEPROM fault
Default Configuration
If a write block of five words with all zeroes is sent to the module,
default selections will be:
• BCD data format
• 100 ohm platinum RTD
• temperature in degrees C
• real time sampling (RTS) = inhibited (sample time = 50ms)
Offset calibration complete
Gain calibration complete
Save complete
RTD Input Module 9
Interpret Status Indicators
RTD
INPUT
RUN
FLT
Green RUN indicator
Red FAULT indicator
10528-I
Troubleshooting
For detailed troubleshooting
information, see chapter 8 of your
RTD Input Module User Manual
(publication 1771-6.5.76).
The front panel of the RTD input module contains a green RUN
indicator and a red FAULT indicator. At power-up, the module
momentarily turns on both indicators as a lamp test, then checks for:
• correct RAM operation
• EPROM operation
• EEPROM operation
• a valid write block transfer with configuration data
If there is no fault, the red indicator turns off.
The green indicator comes on when the module is powered. It will
flash until the module is programmed. If a fault is found initially or
occurs later, the red fault indicator lights. The module also reports
status and specific faults (if they occur) in every transfer of data
(BTR) to the PC processor. Monitor the green and red indicators and
status bits in word 1 of the BTR file when troubleshooting
your module.
Possible module fault causes and corrective action are described in
the following table.
Indicators Probable Cause Recommended Action
RUN (green) off
FLT (red) off
No power to module Check power to I/O
chassis. Recycle as
necessary.
Possible short
LED driver failure Replace module.
RUN (green) on
FLT (red) on
RUN (green) off
FLT (red) on
RUN (green)
blinking
FLT (red) off
RUN (green) on
FLT (red) off
1
When
red LED is on, the watchdog timer has timed out and backplane communications are terminated.
Y
our user program should monitor communication.
Microprocessor, oscillator or EPROM
failure
If immediately after power–up, indicates
RAM or EPROM failure.
If during operation, indicates possible
microprocessor or backplane interface
1
failure.
Power–up diagnostics successfully
completed.
If LED continues to flash, and write block
transfers (BTW) cannot be accomplished,
you have a possible interface failure.
Normal operation None
1
Replace module.
Normal operation.
Check ladder logic
program. If correct,
replace module.
Publication
1771-5.50 – October 1996
RTD Input Module10
le of the
certification product label
le
d’étiquette de certification d’un produit par la
Temperature code ratin
Taux du code de température
CSA Hazardous Location Approval Approbation d’utilisation dans des emplacements dangereux par la
CSA
CSA certifies products for general use as well as for use in hazardous locations.
Actual CSA certification is indicated by the product label
not by statements in any user documentation.
Examp
T
o comply with CSA certification for use in hazardous locations, the following
information becomes a part of the product literature for CSA-certified Allen-Bradley
industrial control products.
• This equipment is suitable for use in Class I, Division 2,
Groups A, B, C, D, or non-hazardous locations only
•
The products having the appropriate CSA markings (that is, Class I Division 2,
Groups A, B, C, D), are certified for use in other equipment where the suitability
of combination (that is, application or use) is determined by the CSA or the local
inspection of
Important:
the highest temperature rating determines the overall temperature code rating of a
PLC control system in a Class I, Division 2 location. The temperature code rating is
marked on the product label
as shown.
CSA
fice having jurisdiction.
Due to the modular nature of a PLC control system, the product with
as shown below
.
La CSA certifie les produits d’utilisation générale aussi bien que ceux qui
, and
s’utilisent dans des emplacements dangereux.
est indiquée par l’étiquette du produit
documentation à l’usage des utilisateurs.
Exemp
Pour satisfaire à la certification de la CSA dans des endroits dangereux, les
informations suivantes font partie intégrante de la documentation des produits
industriels de contrôle Allen
•
Cet équipement convient à l’utilisation dans des emplacements de Classe 1,
Division 2, Groupes A, B, C, D, ou ne convient qu’à l’utilisation dans des
endroits non dangereux.
•
Les produits portant le marquage approprié de la CSA (c’est à dire, Classe 1,
Division 2, Groupes A, B, C, D) sont certifiés à l’utilisation pour d’autres
équipements où la convenance de combinaison (application ou utilisation) est
déterminée par la CSA ou le bureau local d’inspection qualifié.
Important:
produit ayant le taux le plus élevé de température détermine le taux d’ensemble
du code de température du système de contrôle d’un PLC dans un emplacement
de Classe 1, Division 2. Le taux du code de température est indiqué sur l’étiquette
du produit.
Par suite de la nature modulaire du système de contrôle PLC, le
-Bradley certifiés par la CSA.
La certification CSA en vigueur
et non par des af
firmations dans la
CSA
g
Look for temperature code
rating here
The
following warnings apply to products having CSA certification for use in
hazardous locations.
ATTENTION: Explosion hazard —
Substitution of components may impair suitability for Class I,
•
!
Le
sigle CSA est la marque déposée de l’Association des Standards pour le Canada.
PLC est une marque déposée de Allen-Bradley Company
CSA logo is a registered trademark of the Canadian Standards Association
PLC is a registered trademark of Allen-Bradley Company
Division 2.
•
Do not replace components unless power has been switched
of
f or the area is known to be non-hazardous.
•
Do not disconnect equipment unless power has been switched
of
f or the area is known to be non-hazardous.
•
Do not disconnect connectors unless power has been switched
of
f or the area is known to be non-hazardous. Secure any
user-supplied connectors that mate to external circuits on an
Allen-Bradley product using screws, sliding latches, threaded
connectors, or other means such that any connection can
withstand a 15 Newton (3.4 lb.) separating force applied for a
minimum of one minute.
, Inc.
, Inc.
Le taux du code de
température est indiqué ici
Les avertissements suivants s’appliquent aux produits ayant la certification CSA
pour leur utilisation dans des emplacements dangereux.
AVERTISSEMENT: Risque d’explosion —
La substitution de composants peut rendre ce matériel
•
!
inacceptable pour lesemplacements de Classe I, Division 2.
•
Couper le courant ou s’assurer quel’emplacement est désigné
non dangereux avant de remplacer lescomposants.
• A
vant de débrancher l’équipement, couper le courant ou
s’assurer que l’emplacement est désigné non dangereux.
• A
vant de débrancher les connecteurs, couper le courant ou
s’assurer que l’emplacement est reconnu non dangereux.
Attacher tous connecteurs fournis par l’utilisateur et reliés aux
circuits externes d’un appareil Allen-Bradley à l ’aide de vis,
loquets coulissants, connecteurs filetés ou autres moyens
permettant aux connexions de résister à une force de
séparation de 15 newtons (3,4 lb. - 1,5 kg) appliquée pendant
au moins une minute.
Publication
1771-5.50 – October 1996
RTD Input Module 11
Specifications
Description Value
Number of Inputs 6 RTD input channels
Module Location 1771 I/O Chassis
Sensor Type 100 ohm platinum (alpha = 0.00385) or 10 ohm copper
(alpha = 0.00386)
Other types may be used with report in ohms only
Units of measure Temperature in oC
Temperature in oF
RTD resistance in ohms (10milliohms or 30milliohms
resolution)
Temperature Range Platinum: –200 to +870oC (–328 to 1598oF)
Copper: –200 to +260oC (–328 to +500oF)
Resistance Range 1.00 to 600.00 ohms
Resolution Platinum: 0.1oC (0.1oF)
Copper: 0.3oC (0.5oF)
Sensor Excitation 1mA constant current source supplied by module
Common Mode Rejection 120db @ 60Hz up to 1000V peak
Common Mode Impedance Greater than 10 megohms
Normal Mode Rejection 60db @ 60Hz
Input Overvoltage Protection 120V rms continuous
Open RTD Response Time Open excitation (terminal A) to overrange: <0.5sec
Open common (terminal C) to underrange: <0.5sec
Open sense (terminal B): drift high
Scan Time 50ms for 6 channels
Isolation Voltage This isolation meets or exceeds the requirements of UL
Standard 508, and CSA Standard C22.2 No. 142.
Backplane Current 950mA at 5V
Power Dissipation 4.75W maximum
Thermal Dissipation 16.2 BTU/hr
Environmental Conditions
Operating Temperature:
Rate of Change:
Storage Temperature:
Relative Humidity: Operating
Storage
Keying Between 10 and 12
Field Wiring Arm Cat. No. 1771-WF
Wiring Arm Screw Torque 7-9 inch-pounds
Specifications continued on next page
0 to 60oC (32 to 140oF)
Ambient changes greater than 1.0oC/minute may temporarily
degrade performance during periods of change.
–40 to 85
5 to 95% noncondensing
5 to 95% noncondensing
Between 28 and 30
o
C (–40 to 185oF)
Publication
1771-5.50 – October 1996
RTD Input Module12
ValueDescription
Agency Certification
(when product or packaging is marked)
• CSA certified
• CSA Class I, Division 2, Groups A, B, C, D certified
• UL listed
• CE marked for all applicable directives
User Manual Publication 1771-6.5.76
Differences Between
Series A, Series B and
Major differences between series of the 1771-IR RTD Input module
are shown below.
Series C Modules
Description Series A Series B and C
Use of Data Table 8 in; 8 out; 8 read words, 14 write words 8 in; 8 out; 9 read words, 15 write words
Resistance Range 18.4 to 400.00 ohms 1.00 to 600.00 ohms
Common Mode Impedance <50 megohms shunted by <4700pF Greater than 10 megohms
Input Overvoltage Protection 40V rms continuous 120V rms continuous
Scan Time 50ms for 6 channels 50ms for 6 channels
Real Time Sampling None 50ms to 3.1s
Auto-Calibration None Yes – Uses Block Transfer Write word 15
Open RTD Response Time None Open excitation (terminal A) to overrange: <0.5sec
Open common (terminal C) to underrange: <0.5sec
Open sense (terminal B): drift high
Power Dissipation 5.0W maximum 4.75W maximum
Thermal Dissipation 15.0 BTU/hr 16.2 BTU/hr
Agency Certification
(when product or packaging is marked)
• CSA certified
• CSA Class I, Division 2, Groups A, B, C,
D certified
• UL listed
• CSA certified
• CSA Class I, Division 2, Groups A, B, C, D
certified
• UL listed
• CE marked for all applicable directives
Allen-Bradley, a Rockwell Automation Business, has been helping its customers improve
productivity and quality for more than 90 years. We design, manufacture and support a broad
range of automation products worldwide. They include logic processors, power and motion
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Publication
1771-5.50 – October 1996
Publication
1771-5.50 – October 1996
Copyright
1996 Allen-Bradley Company
PN 955126-08
, Inc. Printed in USA
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