Allen-Bradley FLEX Ex 1797-OB4D Installation Instructions Manual
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Allen-Bradley FLEX Ex 1797-OB4D Installation Instructions Manual

Allen-Bradley FLEX Ex 1797-OB4D Installation Instructions Manual

24v dc non-isolated source 4 output module
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FLEX Ex 24V dc Non-Isolated Source 4 Output
Module
(Cat. No. 1797-OB4D)
Important User Information
Solid state equipment has operational characteristics differing from those of
electromechanical equipment. Safety Guidelines for the Application, Installation and
Maintenance of Solid State Controls (Publication SGI-1.1 available from your local Rockwell
Automation sales office or online at http://www.ab.com/manuals/gi) describes some
important differences between solid state equipment and hard-wired electromechanical
devices. Because of this difference, and also because of the wide variety of uses for solid
state equipment, all persons responsible for applying this equipment must satisfy
themselves that each intended application of this equipment is acceptable.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or
consequential damages resulting from the use or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes.
Because of the many variables and requirements associated with any particular installation,
Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on
the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of
information, circuits, equipment, or software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission
of Rockwell Automation, Inc. is prohibited.
Throughout this manual we use notes to make you aware of safety considerations.
Installation Instructions
AB Par
Publication
1797-5.6 - December 2003

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Summary of Contents for Allen-Bradley FLEX Ex 1797-OB4D

  • Page 1 Installation Instructions FLEX Ex 24V dc Non-Isolated Source 4 Output Module (Cat. No. 1797-OB4D) Important User Information Solid state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (Publication SGI-1.1 available from your local Rockwell Automation sales office or online at http://www.ab.com/manuals/gi) describes some important differences between solid state equipment and hard-wired electromechanical devices.

  • Page 2: Important User Information

    2 FLEX Ex 24V dc Non-Isolated Source 4 Output Module Important User Information Identifies information about practices or circumstances that can cause an explosion in a WARNING hazardous environment, which may lead to personal injury or death, property damage, or economic loss.

  • Page 3: Module Installation

    FLEX Ex 24V dc Non-Isolated Source 4 Output Module 3 Module Installation This equipment is considered Group 1, Class A industrial ATTENTION equipment according to IEC/CISPR Publication 11. Without appropriate precautions, there may be potential difficulties ensuring electromagnetic compatibility in other environments due to conducted as well as radiated disturbance.

  • Page 4: Installation In Zone

    4 FLEX Ex 24V dc Non-Isolated Source 4 Output Module 6. Make certain that you only connect terminal base units to other intrinsically safe system modules or adapters to maintain the integrity of the intrinsically-safe backplane. 41307 7. Remove cap plug (8) and attach another intrinsically safe terminal base unit to the right of this terminal base unit if required.

  • Page 5: Electrostatic Charge

    FLEX Ex 24V dc Non-Isolated Source 4 Output Module 5 The IS-RPI cabinets (type IVK2-ISRPI-V8LC, IVK2-ISRPI-V8HYW, or IVK2-ISPRI-V16LC) ensures the basic protection for the intrinsically safe apparatus of the IS-RPI system for use in Zone 22. It corresponds with category 3D according to RL 94/9 EG and with the type label marked with the following information: Pepperl+Fuchs GmbH 68301 Mannheim...
  • Page 6 6 FLEX Ex 24V dc Non-Isolated Source 4 Output Module European Communities (EC) Directive Compliance If this product has the CE mark it is approved for installation within the European Union and EEA regions. It has been designed and tested to meet the following directives.
  • Page 7 FLEX Ex 24V dc Non-Isolated Source 4 Output Module 7 Outputs Each output can operate a discrete field device. Do not apply any non-intrinsically safe signals to this module. When using an intrinsically safe electrical apparatus according to EN50020, the European Community directives and regulations must be followed. The channels in this module are electrically connected to each other.
  • Page 8 8 FLEX Ex 24V dc Non-Isolated Source 4 Output Module 2. Connect the associated output to the corresponding (-) terminal (1, 5, 9, 13) on the 0-15 row (A) for each output as indicated in the table below. 3. Connect +V dc power to terminal 34 on the 34-51 row (C). 4.
  • Page 9 FLEX Ex 24V dc Non-Isolated Source 4 Output Module 9 Wiring Output Output + Output - Output 0 Output 1 Output 2 Output 3 A-12 A-13 C-34 and C-50 C-35 and C-51 Do not use the unused terminals on this terminal base ATTENTION unit.

  • Page 10: Memory Mapping

    10 FLEX Ex 24V dc Non-Isolated Source 4 Output Module Indicators 1797-OB4D 40067 A = Status Indicators - yellow - individual input present; flashing red - channel fault; solid red - module did not pass powerup check; Channel 0 - solid red while power up check is running B = Insertable labels for writing individual input designations C = Power Indicator - green indicates power applied to module Memory Mapping...
  • Page 11 FLEX Ex 24V dc Non-Isolated Source 4 Output Module 11 Oct. Where:O = Output OVL = Overload alarm for individual channel FS = Fault state (0 is reset and 1 is hold last state) FM = Detection of output faults (0 is disable and 1 is enable) L = Latch alarms (0 is disable and 1 is enable) Out Enb = Output Enable FR = Fault reset (0 is normal and 1 is reset)
  • Page 12 12 FLEX Ex 24V dc Non-Isolated Source 4 Output Module Specifications - 1797-OB4D 4 pt Non-Isolated Source Output Module Number of Outputs 4, non-isolated, sourcing IS Output Type EEx ia IIB/IIC T4, AEx ia IIC T4, Class I, II, III Division 1 & 2 Groups A-G T4 IS Module Type EEx ib IIB/IIC T4, AEx ib IIC T4,...
  • Page 13 FLEX Ex 24V dc Non-Isolated Source 4 Output Module 13 Specifications - 1797-OB4D Continued Module Field-Side 7.5W Power Consumption Power Dissipation Thermal Dissipation 17.07 BTU/hr Module Location Cat. No. 1797-TB3 or -TB3S Terminal Base Unit Conductors Wire Size 12 gauge (4mm ) stranded maximum 1.2mm (3/64in) insulation maximum Dimensions...

  • Page 14: Field Descriptions

    14 FLEX Ex 24V dc Non-Isolated Source 4 Output Module Field Descriptions Analog/Digital Output Mode Selects if the channel acts as a normal analog output or as a switched digital output. Analog Output Mode will follow the Analog Data Format selected. Digital Output Mode will output 0mA = OFF, 22mA = ON if the Fault Mode is 0 = disable.
  • Page 15 FLEX Ex 24V dc Non-Isolated Source 4 Output Module 15 Output Enable Signals module that communications has been interrupted to the network. Output modules should execute their fault routine or go to safe state. On power-up, the module remains OFF, 0mA out. After normal power-up, this bit must be set to a “1”...

  • Page 16: Cooperative Operation Of The Controlnet Ex Adapter And Flex Ex Output Modules

    16 FLEX Ex 24V dc Non-Isolated Source 4 Output Module Latch Retry Mode Latch Retry determines channel operation under wire-off fault conditions. These bits control the action of two channel groups - channels 0-3 and/or channels 4-7. When a channel fault occurs, the channel fault alarm will be set (if enabled) and the safe state mode will be enabled.
  • Page 17 FLEX Ex 24V dc Non-Isolated Source 4 Output Module 17 Adapter Operation Network Communication Monitoring The adapter is the primary monitor of network activity. If it detects loss of network communication, it can be programmed to: • continue writing the last valid received data to the module (hold last state) •...
  • Page 18 18 FLEX Ex 24V dc Non-Isolated Source 4 Output Module FLEX Ex Output Module Operation Flexbus Communication Monitoring The module monitors flexbus communication activity and the state of its Output Enable bit. If it detects loss of flexbus communication activity or the Output Enable bit transitioning to 0, it can be programmed to: •...
  • Page 19 FLEX Ex 24V dc Non-Isolated Source 4 Output Module 19 CE, CENELEC I/O Entity Parameters Signal output (+ to -) for ch 0 to ch 3 (terminals: 0-1; 4-5; 8-9; 12-13) Protection Group Allowed Allowed Capacitance Inductance 1797-OB4D EEx ia 677nF = 27.4V 87nF...

  • Page 20: Wiring Methods

    110.0 A, B, IIC 0.03 channel C, E, IIB 0.09 e.g. ch0 D, F, G, IIA 0.24 16.0 Allen-Bradley 1797- OB4D Key Position for 4 Point Source Output Module Terminal Base FLEX Ex Discrete Insertion Output I/O Module LEDs Male Bus...
  • Page 21 FLEX Ex 24V dc Non-Isolated Source 4 Output Module 21 A terminal base may or may not have an I/O module IMPORTANT installed. Hazardous (Classified) Location Hazardous (Classified) Location Class I, Zones 0, 1, & 2 Groups IIC, IIB, IIA Class I, Zones 1 &...
  • Page 22 22 FLEX Ex 24V dc Non-Isolated Source 4 Output Module The entity concept allows interconnection of intrinsically safe apparatus with associated apparatus not specifically examined in combination as a system when the approved values of V and I or V and I of the associated apparatus are less than or equal to V...

  • Page 23: Fm I/O Entity Parameters

    FLEX Ex 24V dc Non-Isolated Source 4 Output Module 23 FM I/O Entity Parameters 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 •...
  • Page 24 24 FLEX Ex 24V dc Non-Isolated Source 4 Output Module Allen-Bradley Key Position for 1797- OB4D 4 Point Source Output Module Terminal Base FLEX Ex Discrete Insertion Output I/O Module LEDs Male Bus Connection Female Bus Connection Terminal Base Field Wiring...
  • Page 25 FLEX Ex 24V dc Non-Isolated Source 4 Output Module 25 Hazardous (Classified) Location Hazardous (Classified) Location Class I, Zones 0, 1, & 2 Groups IIC, IIB, IIA Class I, Zones 1 Groups IIC, IIB, IIA Class I, Div. 1 & 2 Groups A, B, C, D Class I, Div.
  • Page 26 26 FLEX Ex 24V dc Non-Isolated Source 4 Output Module The entity concept allows interconnection of intrinsically safe apparatus with associated apparatus not specifically examined in combination as a system when the approved values of V and I or V and I of the associated apparatus are less than or equal to V...

  • Page 27: Output Voltage/Current Capability

    FLEX Ex 24V dc Non-Isolated Source 4 Output Module 27 Output Voltage/Current Capability Voltage 41313 For detailed certification information, refer to the FLEX IMPORTANT Ex System Certification Reference Manual, publication 1797-6.5.6. Attention: Avoid electrostatic charge. AB Par Publication 1797-5.6 - December 2003...

  • Page 28: Rockwell Automation Support

    Rockwell Automation Support Rockwell Automation provides technical information on the web to assist you in using our products. At http://support.rockwellautomation.com, you can find technical manuals, a knowledge base of FAQs, technical and application notes, sample code and links to software service packs, and a MySupport feature that you can customize to make the best use of these tools.

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