Allen-Bradley 1797-BIC User manual

FLEX Ex is a trademark of Rockwell Automation1Publication 1797-5.13 - August 2001
Installation Instructions
FLEX Ex Bus Isolator and Flexbus
Connector
(Cat. No. 1797-BIC, -CEC)
Use the FLEX ExTM bus isolator to interconnect standard FLEX I/OTM
modules to intrinsically safe FLEX Ex modules in the same I/O group.
Component Identification
1 Indicators
2 Label
3 Module locking tab
4 Removable power connector
5 FLEX Ex backplane connector
6 FLEX Ex backplane connector cover
7 Master backplane connector
8 FLEX I/O backplane connector
QUALI TY
B
-
A
Allen-Bradley
1797 - CEC
FLEXBUS
CONNECTOR
12 4
3
+V -V +V -V
1797 - BIC
PWR
QUALITY
B
-
A
Allen-Bradley
FLEXBUS
ISOLATOR
42641
1
2
34
5
6
7
8
2
3
1797-CEC 1797-BIC

2FLEX Ex Bus Isolator and Flexbus Connector
Publication 1797-5.13 - August 2001
Product Features
•Provides an IS-compatible mechanism to separate two sections
of the backplane allowing IS and non-IS field-device wiring to
the same I/O group
•Converts hazardous power to IS-safe power to run one side of
the bus receiver/transmitter circuitry and IS-safe FLEX Ex
backplane power to slave side modules
•Module: [EEx ib] IIB/IIC
•Up to eight FLEX Ex modules may be attached to the slave
side
Intermixed Systems
The bus isolator modules, 1797-BIC and -CEC, allow you to configure
FLEX Ex modules and FLEX I/O modules on the DIN rail when
attached to the same adapter and grouped together on appropriate
sides of the bus isolator module. This highly flexible, cost-effective
solution combines intrinsically safe and non-intrinsically safe systems.
Intermixed systems can be configured for use in the:
•safe area much like traditional IS and I/O systems
•hazardous and safe control equipment where the distance of
physical separation is short
•FLEX Ex I/O with communication adapters that are not
intrinsically safe
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Mi
x
i
ng
S
ystems
i
n
the Safe Area
any communication
adapter supported by
FLEX I/O
Bus Isolator
1797-CEC
1797-BIC
FLEX I/O
Nonhazardous Area
or
Zone 2
Hazardous Area
Zone 1
1794-CE3
FLEX Ex Maximum of 1m
Field Wiring to
Zone 0
40087

FLEX Ex Bus Isolator and Flexbus Connector 3
Publication 1797-5.13 - August 2001
Use the appropriate connection on the explosion-proof enclosure:
For Metric Threads on the Connector:
Part Number Manufacturer
RS-FEED.M Pepperl+Fuchs
07-9109-99979XP1 Bartec
For NPT Threads on the Connector:
Part Number Manufacturer
RS-FEED.NPT Pepperl+Fuchs
07-9199-99979XP1 Bartec
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Mixing Systems in
the Hazardous Area
any communication adapter
supported by FLEX I/O
1797-CEC 1797-BIC
Non-
hazardous
Area
or
Zone 2
Hazardous Area
Zone 1
1794-CE3
FLEX Ex Max
of 1m
Field Wiring to
Zone 0
40088
1797-CE1S
Note: A maximum of one 1794-CE1 cable and one
1794-CE3 cable can be attached onto the 1797-BIC module.

4FLEX Ex Bus Isolator and Flexbus Connector
Publication 1797-5.13 - August 2001
General Installation
The 1797-CEC and -BIC must not be exposed to the environment.
These modules have a protection factor of IP20. Provide a suitable
metal enclosure. If these modules are to be installed into a Zone 2
area, then ensure that this enclosure has a protection class of IP54.
Make certain that you only connect the FLEX Ex backplane connector
to other intrinsically safe system modules to maintain the integrity of
the intrinsically-safe backplane.
Electrostatic Charge
Protect the system against electrostatic charge. Post a sign near this
module: Attention! Avoid electrostatic charge. For your
convenience, a sign which can be cut out is included in this
installation instruction.
ATTENTION
!
The 1797-BIC cannot be used as an associated
apparatus after its FLEX Ex backplane connector
has been exposed to non-intrinsically safe
signals.
ATTENTION
!
For proper operation, cycle power to the
1797-BIC at the same time power is cycled to the
associated adapter.
1794
Adapter
1797
CEC
1797
BIC
1797 I/O
& Base
1797 I/O
& Base
1797 I/O
& Base
1797 I/O
& Base
1797
power
supply
24V dc
power
supply 42754

FLEX Ex Bus Isolator and Flexbus Connector 5
Publication 1797-5.13 - August 2001
European Community Directive Compliance
If this product has the CE mark it is approved for installation within
the European Community or EEA regions. It has been designed and
tested to meet the following directives.
EMC Directive
The 1797-BIC and -CEC are tested to meet the Council Directive 89/
336/EC Electromagnetic Compatibility (EMC) by applying the
following standards, in whole or in part, documented in a technical
construction file:
•EN50081-2
EMC - Generic Emission Standard, Part 2 - Industrial
Environment
•EN50082-2
EMC - Generic Immunity Standard, Part 2 - Industrial
Environment
This product is intended for use in an industrial environment.
Ex Directive
The 1797-BIC is tested to meet the Council Directive 94/9 EC (ATEX
95) Equipment and Protective Systems Intended for Use in Potentially
Explosive Atmospheres by applying the following standards:
•EN50014:1997, Electrical Apparatus for Potentially Explosive
Atmospheres
•EN50020:1994, Electrical Apparatus for Potentially Explosive
Atmospheres - Intrinsic Safety “i”
•EN50021:1999, Electrical Apparatus for Potentially Explosive
Atmospheres - Type of Protection “n”
The 1797-CEC is tested to meet the Council Directive 94/9 EC (ATEX
95) Equipment and Protective Systems Intended for Use in Potentially
Explosive Atmospheres by applying the following standards:
•EN50021:1999, Electrical Apparatus for Potentially Explosive
Atmospheres - Type of Protection “n”

6FLEX Ex Bus Isolator and Flexbus Connector
Publication 1797-5.13 - August 2001
FM Compliance
If this product has the FM mark, it has been designed, evaluated,
tested, and certified to meet the following standards:
•FM C1. No.3600:1998, Electrical Equipment for Use in
Hazardous (Classified) Locations General Requirements
•FM C1. No.3610:1999, Intrinsically Safe Apparatus and
Associated Apparatus for Use in Class I, II, III Division 1
Hazardous (Classified) Locations
•FM C1. No.3615:1989, Explosionproof Electrical Equipment
General Requirements
•FM C1. No.3810:1989, 1995, Electrical and Electronic Test,
Measuring and Process Control Equipment
•ANSI/NEMA 250, 1991, Enclosures for Electrical Equipment
Inputs/Outputs
Do not apply any non-instrinsically safe signals to the FLEX Ex
backplane connector.
When using as an intrinsically safe electrical apparatus according to
EN50020, the European directives and regulations must be followed.
Customer Connections
1797-CEC 1797-BIC
flexbus flexbusflexbus
PWR
limit
Bus
Bus
+V
-V
standard
power
source
41693
FLEX Ex
bus
IS flexbus
IS flexbus

FLEX Ex Bus Isolator and Flexbus Connector 7
Publication 1797-5.13 - August 2001
1797-CEC Module Installation
The 1797-CEC module mounts on a DIN rail. It connects to an
adapter or another FLEX I/O module. Note: If using this module with
FLEX I/O modules, do not mount between FLEX I/O modules. Mount
the 1797-CEC module to the right of FLEX I/O modules. To mount
this module:
1. Remove the cover plug (if used) in the male connector of the
unit to which you are connecting this module.
2. Position the module on the 35 x 7.5mm DIN rail A(A-B pt. no.
199-DR1).
3. Rotate the module onto the DIN rail with the top of the rail
hooked under the lip on the rear of the module.
1797-CEC
42642
A
A

8FLEX Ex Bus Isolator and Flexbus Connector
Publication 1797-5.13 - August 2001
4. Press down to lock the module on the DIN rail.
If the module does not lock in place, use a screwdriver of
similar device to move the locking tab down, press the
module flush with the DIN rail and release the locking tab to
lock the module in place.
5. Firmly push the module into the adjacent module/terminal
base until the units lock together.
41377
1797-CEC
42643

FLEX Ex Bus Isolator and Flexbus Connector 9
Publication 1797-5.13 - August 2001
6. To remove the 1797-CEC module, you must work from the
right side and remove one module at a time. To disengage a
module from its neighbor, place a common flat-bladed
screwdriver between the two modules and turn 1/4 turn to
separate the modules.
7. Then slide the module away from its left neighbor, and release
the locking lever to remove the module from the DIN rail.
1797-CEC
42644

10 FLEX Ex Bus Isolator and Flexbus Connector
Publication 1797-5.13 - August 2001
1797-BIC Module Installation
The 1797-BIC module mounts on a DIN rail. It connects to a
1797-CEC module.
1. Remove the cover plug (if used) in the male connector of the
unit to which you are connecting this module.
2. Position the module on the 35 x 7.5mm DIN rail A(A-B pt. no.
199-DR1).
3. Rotate the module onto the DIN rail with the top of the rail
hooked under the lip on the rear of the module.
4. Press down to lock the module on the DIN rail.
1797-CEC
13
24
+V +V
-V -V
PWR
FLEXBUS
ISOLATOR
1797-BIC
42645
A
A
1797-CEC
13
24
+V +V
-V -V
PWR
FLEXBUS
ISOLATOR
1797-BIC
42646

FLEX Ex Bus Isolator and Flexbus Connector 11
Publication 1797-5.13 - August 2001
If the module does not lock in place, use a screwdriver of
similar device to move the locking tab down, press the
module flush with the DIN rail and release the locking tab to
lock the module in place.
5. Firmly push the module into the adjacent module/terminal
base until the units interconnect.
6. Install DIN rail locks (supplied with the 1797-BIC module) to
meet shock and vibration specifications as listed on page 15.
7. To remove the 1797-BIC, remove the DIN rail locks and then
slide the module away from its left neighbor, and release the
locking lever to remove the module from the DIN rail.
ATTENTION
!
Do not remove the 1797-CEC or -BIC under
power. Remove these modules under power will
break the electrical backplane (flexbus)
connections. This can cause personal injury or
property damage by:
•sending an erroneous signal to your system’s
field devices causing unintended machine
motion
•causing an explosion in a hazardous
environment
•breaking communication to modules beyond
this module
1797-CEC
13
24
+V +V
-V -V
PWR
FLEXBUS
ISOLATOR
1797-BIC
42647

12 FLEX Ex Bus Isolator and Flexbus Connector
Publication 1797-5.13 - August 2001
Wiring
1. Apply +V and -V power (24V dc) to the adapter through a
removable terminal block.
Screw terminals and spring terminals are provided.
ATTENTION
!
When connecting wiring, torque terminal
screws to 7-9 inch-pounds.
ATTENTION
!
Make certain that you power this device with
normal 24V dc. Do not use an intrinsically safe
power supply, such as the 1797-PS2E or -PS2N,
to power this module.
12 4
3
+V -V +V -V
1797 - BIC
POWER
QUALITY
B
-
A
Allen-Bradley
FLEXBUS
ISOLATOR
42648
+V -V +V -V
+V -V +V -V
41297

FLEX Ex Bus Isolator and Flexbus Connector 13
Publication 1797-5.13 - August 2001
2. Strip the +V and -V wires to a length so no bare conductor
shows after inserting the wires into position (+V, -V).
3. If you are using the spring terminals of the plug, insert a
screwdriver into the slot and carefully pry until the spring
clamp opens to accept the wire.
4. Connect either a 1797-TB3 module, a 1794-CE1 or a 1794-CE3
cable onto the FLEX Ex backplane connector of the 1797-BIC
module.
Indicators
The 1797-BIC module provides a LED indicating power has been
applied to the module.
1797-BIC Mounting Dimensions
Repair
The 1797-BIC is not field-repairable. Any attempt to open the module
will void its warranty and the IS certification. If repair is necessary,
return the module to the manufacturer.
ATTENTION
!
The FLEX Ex backplane connector cover must
remain in place until a FLEX Ex terminal base or
cable is connected to the 1797-BIC module.
13
24
+V +V
-V -V
PWR
FLEXBUS
ISOLATOR
1797-BIC
41413
2.95
(75)
3.7
(94)
3.4
(87)
Inches
(Millimeters)

14 FLEX Ex Bus Isolator and Flexbus Connector
Publication 1797-5.13 - August 2001
1797-CEC Mounting Dimensions
Repair
The 1797-CEC is not field-repairable. Any attempt to open the module
will void its warranty. If repair is necessary, return the module to the
manufacturer.
1797-CEC
41413
2.72
(69)
2.17
(55)
3.15
(80)
Inches
(Millimeters)

FLEX Ex Bus Isolator and Flexbus Connector 15
Publication 1797-5.13 - August 2001
1797-BIC Specifications
I/O Module Capacity 8 FLEX Ex modules1
Indicators Power green
Isolation Path
Flexbus to Flexbus
Flexbus Slave Side
to Power Supply
Galvanic to DIN EN50020
Galvanic to DIN EN50020
Power Consumption 18V - 32V dc @ 0.15A
Power Source Failure
Maximum Input Um= 253V ac
Power Dissipation 2.1W
Thermal Dissipation 7.2 BTU/hr
IS Module Type [EEx ib] IIC
Conductor Wire Size 12 gauge (4mm2) stranded maximum
3/64in (1.2mm) insulation maximum
Weight Approximately 200g
Environmental Conditions
Operational Temperature -20 to 70oC (-4 to 158oF)
Storage Temperature -40 to 85oC (-40 to 185oF)
Relative Humidity 5 to 95% noncondensing
Shock Operating Tested 30g peak acceleration, 11 (±1)ms pulse width
Non-Operating Tested 30g peak acceleration, 11 (±1)ms pulse width
Vibration Tested 5g @ 10-500Hz per IEC 68-2-6
Output (Intrinsically Safe)
(16 pin male and female flexbus
connector)
CENELEC
Uo<5.75V dc
Io<400mA
Po<2.05W
Lo<100µH
Co<39µF
Output (Intrinsically Safe)
(16 pin male and female flexbus
connector)
FM
Vi<5.75V dc
It<398.25mA
Ca<39.67µF
La<210µH
Agency Certification
CENELEC II (2)G [EEx ib] IIC
FM Nonincendure, use for Class I, Division 2 Groups A-D or
Class I, Zone 2 Group IIC
Provides intrinsically safe outputs to Class I, Division 1
Groups A-D or Class I, Zone 1 Group IIC

16 FLEX Ex Bus Isolator and Flexbus Connector
Publication 1797-5.13 - August 2001
Certificates
CENELEC DMT 00 ATEX E056
FM FM Certificate Number 3010810
Declaration of Conformity
Directive 94/9 EC Zone 2
II 3G EEx nA IIC T4 X
1 A total of eight I/O modules can be attached to a 1794 FLEX I/O adapter. The 1797-CEC
and -BIC are not included in this number. In intermixed systems, the number of 1797
FLEX Ex I/O modules (attached onto the 1797-BIC) plus the number of 1794 FLEX I/O
modules (connected between the adapter and the 1797-CEC) cannot exceed eight.
1797-CEC Specifications
Indicators Not applicable
Weight Approximately 100g
Environmental Conditions
Operational Temperature -20 to 70oC (-4 to 158oF)
Storage Temperature -40 to 85oC (-40 to 185oF)
Relative Humidity 5 to 95% noncondensing
Shock Operating Tested 30g peak acceleration, 11 (±1)ms pulse width
Non-Operating Tested 30g peak acceleration, 11 (±1)ms pulse width
Vibration Tested 5g @ 10-500Hz per IEC 68-2-6
Agency Certification
FM Nonincendure, use for Class I, Division 2 Groups A-D or
Class I, Zone 2 Group IIC
Certificates
FM FM Certificate Number 3010810
Declaration of Conformity
Directive 94/9 EC Zone 2
II 3G EEx nA IIC T4 X

FLEX Ex Bus Isolator and Flexbus Connector 17
Publication 1797-5.13 - August 2001
CENELEC Information
The isolator type 1797-BIC/* is an associated apparatus according to
EN 50020. If the isolator is connected to intrinsically safe circuits the
applicable national local construction, installation and operating
regulations must be heeded (in Germany DIN EN 50020, DIN VDE
0165).
FM Information
Diagram 1
Diagram 2
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...
Nonhazardous or Hazardous
(Classified) Location
Class I, Zone 2, Group IIC or
Class I, Division 2, Groups A-D
Nonhazardous or Hazardous
(Classified) Location
Class I, Zone 1, Group IIC or
Class I, Division 1, Groups A-D

42876
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Nonhazardous or Hazardous
(Classified) Location
Class I, Zone 2, Group IIC or
Class I, Division 2, Groups A-D
Nonhazardous or Hazardous
(Classified) Location
Class I, Zone 1, Group IIC or
Class I, Division 1, Groups A-D

42877

18 FLEX Ex Bus Isolator and Flexbus Connector
Publication 1797-5.13 - August 2001
I/O module capacitance value is cumulative. Ci (total) = Ci (I/O
module 1) + Ci (I/O module 2) + ...Ci (I/O module 8). Ci (total) must
be less than 65F. The limitation of eight I/O modules per isolator is a
functional limitation. Refer to table 2 of the appropriate I/O Modules
sections in this document (1797-6.5.6).
Application
The isolator type 1797-BIC/* functions as a galvanic isolation barrier
for signals between a non-intrinsic backplane bus and an intrinsic
safe backplane bus. The isolator must be installed in a safe or Zone 2
area.
Cover Plug for IS Backplane Bus
The 16-pole male connector for the FLEX Ex IS backplane bus is
provided with a cover plug. The cover plug can only be removed
when a 1797-TB3 terminal base, a 1794-CE1 or a 1794-CE3 cable is
connected. The connection must not be connected to any signals
which exceed the instrinsically safe values of the IS backplane.
Power Supply
The isolator is powered via a removable terminal connector with a
dc-voltage between 18V and 32V. Due to a failure in the power
supply a maximum voltage Umof 253V ac is permitted.
Repair
The isolator is not field repairable. Any attempt to open this device
will void the warranty and IS certification. If repair is necessary,
return this device to the factory.
Isolator Restriction
1797-BIC and -CEC Maximum of 8 I/O modules


FLEX Ex Bus Isolator and Flexbus Connector 19
Publication 1797-5.13 - August 2001
ControlNet is a trademark of ControlNet International.
ControlNet Ex is a trademark of Rockwell Automation.
IMPORTANT For detailed certification information, refer to the
FLEX Ex System Certification Reference Manual,
publication 1797-6.5.6.
Attention: Avoid electrostatic charge.

Publication 1797-5.13 - August 2001 PN 957555-70
Supersedes Publication 1797-5.13 - February 2001 © 2001 Rockwell International Corporation. Printed in USA
Notes: