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AK00_III

Product catalog summary

Overview

The IS1+ Remote I/O system is a modern, cost-effective, and flexible solution designed for intrinsically safe inputs and outputs, suitable for direct installation in hazardous areas (Zones 1, 2, 21, 22 and Divisions 1, 2). It supports various fieldbus protocols and is engineered for easy system planning, installation, and maintenance.

System Components

BusRail: Internal bus and power supply backbone for I/O modules.
CPU & Power Module: Handles fieldbus communication and power supply.
I/O Modules: Available with 4, 6, 8, or 16 channels for process signal inputs and outputs.

Modules snap onto a 35 mm DIN rail with automatic addressing, and the BusRail can be extended via cable-connected segments. Suitable enclosures are available for different hazardous zones and classes.

Explosion Protection and Installation

The system complies with ATEX, IECEx, NEC 500, NEC 505, and NEC 506 standards, supporting installation in Class I, II, III hazardous areas with Division 1 and 2, and Zones 0, 1, 2, 20, 21, 22. Intrinsically safe interfaces and fieldbus isolating repeaters ensure safety in Zone 1/Division 1 installations. Restrictions apply as noted in the explosion protection tables.

Fieldbus Communication

Supported fieldbus protocols include:

Profibus DP V0 and DP V1 HART (up to 1.5 Mbit/s)
Modbus RTU (up to 38.4 kbit/s)
Industrial Ethernet / Modbus TCP
EtherNet/IP and PROFINET (in preparation)

Functions supported include configuration, parameter loading, cyclic data exchange, alarm and diagnostic data reading, and HART command transmission. The system supports up to 31 intrinsically safe RS485-IS field stations per segment and up to 32 devices on non-intrinsically safe RS485 segments.

Redundancy and Availability

High system availability is ensured through:

Line Redundancy: Redundant fieldbus cables.
Full Redundancy: Redundant CPU & Power Modules.
Redundant Internal Bus: The internal BusRail communication is always redundant.

Hot Swap Capability

All modules, including CPU & Power Modules in Zone 1/Division 1, can be replaced during operation without disconnecting field wiring. The CPU & Power Module automatically detects new modules, loads parameters, and starts them. For Profibus DP, the CPU & Power Module replacement requires only setting the fieldbus address, with configuration downloaded automatically.

ServiceBus Interface

The CPU & Power Module includes a ServiceBus interface allowing connection of up to 128 field stations. The network is designed to maintain data transmission even if a station fails. In Zone 1/Division 1, data is transmitted to the safe area via a common cable with isolating repeaters acting as interfaces.

Asset Management and HART Integration

The system supports full HART transparency, transmitting analog signals alongside HART variables in floating point format. HART commands can be exchanged via ServiceBus or fieldbus protocols. Compatible software packages include:

Cornerstone (ASTEC), AMS (Emerson), Fieldcare (Endress+Hauser), PDM (Siemens), PRM (Yokogawa), FDM (Honeywell) on ServiceBus.
PDM and AMS on Profibus with EDD and DTM support.
AMS and other packages via Ethernet gateways.
PDM and others via automation system controllers with routing-capable components.

Applications and Examples

Combination of Electrical and Pneumatical Signals: Intrinsically safe solenoid valves controlled via digital output modules within Zone 1 field stations, reducing cabling and space.
Loading Arm Control: Redundant IS1 stations controlling sensors and equipment on offshore shipping piers in Zone 1.
Mobile Offshore Drilling Unit: Customized stainless steel enclosure solutions for Class I Division 1 installations with Profibus DP communication.
Remote I/O with Operator Interfaces: Explosion-protected operator interfaces combined with IS1 Remote I/O systems in Zone 1 outdoor chemical industry applications.

Supported I/O Modules and Signal Types

The system supports a wide range of I/O modules for various signal types, including:

2-wire, 3-wire, and 4-wire transmitters (including HART and SIL 2 capable)
I/P converters and control valves (including HART versions)
Resistance thermometers (RTD), potentiometers, thermocouples
Contact and optocoupler outputs, NAMUR proximity switches
Active 0/24 V signals, counters, frequency inputs
Solenoid valves and indicators (including SIL 2 capable)
Fieldbus interface modules for Modbus, Profibus DP, Modbus TCP, and PROFINET

Technical Notes and Limitations

Maximum number of field stations per intrinsically safe RS485-IS segment is 31.
Maximum devices on non-intrinsically safe RS485 fieldbus is 32.
Ethernet-based protocols like EtherNet/IP and PROFINET are in preparation.
Hot swap functionality requires proper configuration and fieldbus support.
Explosion protection restrictions apply as per detailed tables.

Summary

The IS1+ Remote I/O system by R. STAHL offers a robust, intrinsically safe, and flexible solution for process automation in hazardous environments. Its modular design, extensive fieldbus support, redundancy features, and integration with asset management and HART technologies make it suitable for a wide range of industrial applications requiring high availability and safety compliance.

Catalog excerpts

> Intrinsically safe Ex ia IIC, Ex e, Ex nA or Ex nL inputs and outputs > Fieldbus communication: Modbus RTU, Profibus DP V0 and DP V1 HART, Industrial Ethernet, Modbus TCP, EtherNet/IP, PROFINET > Hot swap for all modules > Full redundancy or media redundancy > Optional ServiceBus for parameterization, fault diagnostics and HART communication > DTM technology for full access to all system and HART field device information > Field enclosures in many versions, engineered to choice IS1+ is extremely simple to use: A CPU & Power Module and several input/output modules are snapped on to the BusRail (35 mm DIN rail). The unique power supply concept, developed especially for use in hazardous areas, makes system planning as simple as for normal industrial I/O systems. Plug & play without separate engineering tools. IS1+ is particularly flexible: Suitable for small and big signal quantities with field stations installed in safe or explosive atmospheres. An intrinsically safe fieldbus using copper-wire or fibre-optic technology connects field stations in Zone 1 / Division 1 with the automation devices. The system is completely HART transparent. IS1+ is extremely economical: Modules with 8 or 16 inputs lower the price per signal. DTM technology is used for full integration into standard Asset Management and Engineering systems allowing easy and fast commissioning, trouble shooting and maintenance. ATEX / IECEx Class I Class II Class III Restrictions see table explosion protection

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Overview of the system components 1> when installed in Zone 1 only; in Zone 2: RS485

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A4 System Description The IS1 system provides a modern, cost-effective and flexible remote I/O system with intrinsically safe inputs and outputs, suitable for direct installation in hazardous areas. The uniform system concept permits installation in Zone 1 / Division 1, in Zone 2 / Division 2, Zone 21, Zone 22 and in a safe area. Suitable enclosures for different Zones, Classes and Divsions are available. Inputs and outputs are optimized for the sensors and actuators used in process technology. CPU & Power Module I/O Modules Plug-in terminals The integration of different fieldbuses permits digital...

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Redundancy The high system availability that is required for applications in the process industry is guaranteed through a proven redundancy concept. Various redundancy stages permit adaptation to the availability requirements of the user: • Fieldbus cable redundancy (Line redundancy) • CPU & Power Module redundancy (Full redundancy) The internal bus of an IS1 field station is always redundantly configured. Redundant CPU & Power Module Redundant fieldbus cable 07670E02 Line redundancy Full redundancy Fieldbus plug connector All modules in the IS1 system can be replaced at any time during station...

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A4 Fieldbus The fieldbus is the connection between the CPU & Power Module and the automation system. Input and output data between the field stations and the automation equipment are exchanged over the fieldbus. Fieldbuses that can be connected: • Profibus DP V0 and DP V1 HART, up to 1.5 MBit / s • Modbus RTU, up to 38.4 kBit / s • Industrial Ethernet / Modbus TCP Depending on the functionality of the fieldbus, the following functions are supported: • Configuration of the IS1 field station or read back the configuration • Load the modules with parameters • Read/write input and output data • Read...

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Asset Management and HART The process value of a HART field device is always transmitted as an analog signal along with the 4 ... 20 mA signal. Moreover, the HART variables (P1 ... PV4) of the HART I/O modules can be read and transmitted in floating point format (4 Byte IEEE) in the cyclic data exchange (Profibus DP V0) to the automation system. The IS1 field station behaves transparently for the exchange of HART commands between IS1 and engineering stations. The transmission of HART commands occurs either via the ServiceBus or the fieldbus (Profibus DP V1 HART, Modbus RTU, 1 The following software...

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A4 Examples of Application Combination of Electrical and Pneumatical Signals • Intrinsically safe solenoid valves with Remote I/O within a Zone 1 field station • Direct activation of the Ex i / I.S. solenoid valves via digital output modules IS1 • Reduction of cabling and required space • Communication with the automation system via Profibus DP (RS 485-IS) Loading Arm Control for Chemical-, Oil- and Gas Tankers Industry: Hazardous area: Installation: Machine and plan construction Zone 1 Shipping pier offshore harbour STAHL-assemblies: • Control equipment, Ex i / I.S. indicating lamps • Pushbuttons...

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Examples of Application Mobile Offshore Drilling Unit Industry: Hazardous area: Installation: Oil & Gas Class I Division 1 Arabian Gulf Saudi Arabia Highlights: • Remote I/O system IS1 with Profibus DP communication • Fully assembled, tested and certified • Stand alone • Customized solution for Class I Division 1 installation • Stainless steel enclosure Series 8125 • High quality stainless steel for offshore use Combination of Remote I/O with Operator Interfaces Industry: Hazardous area: Installation: Chemical Zone 1 Outside Highlights: • Remote I/O System IS1 with Profibus DP communication •...

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A4 Application Remote I/O Symbol I/O-modules Series I/P converter, control valve I/P converter, HART control valve Resistance thermometer (RTD), potentiometer

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Application Remote I/O Symbol I/O-modules Series We reserve the right to make alterations to the technical data, dimensions, weights, designs and products available without notice. The illustrations cannot be considered binding.

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