In redundant mode, two modules are connected to a common Terminal Assembly (TA) via a Redundancy Adapter (RH916QD), providing Fieldbus Module (FBM)-level redundancy to ensure output stability in critical control applications. Its robust structural design meets the G3 (severe) environmental requirements specified in ISA Standard S71.04. Compatible with HART standard signals, it supports local or remote field wiring and features a maintenance bypass function, making it widely suitable for signal output requirements in various industrial control systems.

related documents

FBM237 RH914XS.pdf

Core Functions & Features

Channel & Signal Characteristics

Redundancy Assurance Mechanism

When a fault is detected in one module, the output of the faulty module will automatically drive down to 0 mA, while the corresponding channel of the normal module will seamlessly take over to provide the correct current output, ensuring uninterrupted field signals. In addition, the redundant power supply of the modules is combined through the diode "OR" logic in the redundancy adapter, further improving power supply reliability. The module also supports configurable options such as fail-safe action configuration (hold/fallback), channel-independent analog output fail-safe fallback data (default set to 0 mA), fieldbus fail-safe enable and delay time setting, minimizing the risk of "fault high level".

Hardware Design & Reliability

The high-reliability design is reflected in multiple aspects: either module in a redundant pair can be hot-swapped and replaced without interrupting field output signals, disconnecting field device wiring, power supply and communication cables. The module microprocessor not only executes analog output application programs but also has built-in safety routines to continuously verify the module health status. Combined with the high coverage rate of fault detection, it significantly improves the uptime of the subsystem. The integrated front-end LED indicators can visually display the module operating status, facilitating maintenance personnel to quickly troubleshoot problems.

Communication & Installation Compatibility

It features flexible installation methods: the module must be mounted on a standard modular backplane, which supports DIN rail mounting (horizontal or vertical) or 19-inch rack mounting (installation kit required). Redundant modules need to occupy adjacent odd/even position pairs on the backplane (1&2, 3&4, 5&6, 7&8) and be used with a redundancy adapter; non-redundant modules can be mounted via a Series 100 conversion mounting structure. The Terminal Assembly (TA) also adopts DIN rail mounting, compatible with various 32 mm and 35 mm rails, supporting crimp or ring terminal wiring methods, and adaptable to 0.2–4 mm² solid/stranded AWG cables (24–12 AWG) or 0.2–2.5 mm² stranded cables with or without plastic ferrules.

Technical Specifications

Power Supply & Power Consumption

• Input Voltage: 24 VDC (allowable range: +5%, -10%), supporting redundant power supply
• Maximum Power Consumption: 7 W (redundant mode), 5 W (single-module mode)
• Maximum Heat Dissipation Power: Matching the power consumption, meeting the heat dissipation requirements of industrial environments

Environmental Adaptability

• Temperature: For modules and Terminal Assemblies (PA material), the operating temperature ranges from -20°C to +70°C (-4°F to +158°F); the storage temperature ranges from -40°C to +70°C (-40°F to +158°F).
• Relative Humidity: 5% to 95% (non-condensing) for both operating and storage conditions.
• Altitude: The operating altitude ranges from -300 m to +3,000 m (-1,000 ft to +10,000 ft); the storage altitude ranges from -300 m to +12,000 m (-1,000 ft to +40,000 ft).
• Vibration: Resistant to 0.75g vibration within the frequency range of 5 Hz to 500 Hz under operating conditions.
• Pollution Degree: Complies with ISA S71.04 G3 (severe) environmental standards, based on EIA 364-65 Class III exposure testing.

Physical Specifications

• Module Dimensions: Height 102 mm (114 mm including mounting lugs), width 45 mm, depth 104 mm
• Module Weight: Approximately 185 g (6.5 oz)
• Terminal Assembly Weight: Crimp type approximately 181 g (0.40 lb); ring terminal type approximately 249 g (0.55 lb)
• Wiring Cables: Compatible with polyurethane or Low Smoke Zero Halogen (LSZH) cables, with a maximum length of 30 m (98 ft), adopting 25-pin D-sub male connectors

Main Functions

 I/O Data Processing

The module occupies a single IC66 PLC slot* and asynchronously scans IC66 I/O modules*. It transmits I/O data to the CPU via the backplane of the IC697 PLC rack upon each scan, ensuring real-time data synchronization. Meanwhile, it receives output commands and control instructions (e.g., clearing circuit faults) issued by the CPU and updates them to the corresponding I/O modules.

Communication Node Function

It can serve as a communication node to connect other bus controllers, PCIM modules and IC66 devices* via the IC66 bus*, establishing a communication network between multiple PLCs and upper computers and supporting peer-to-peer data transmission.

Fault Management

Faults reported by the bus controller are centrally managed by the PLC alarm processor. Fault information is recorded with timestamps and stored in tables, facilitating user inquiry and troubleshooting.

3.4 Command Interaction Support

It performs command interaction with the CPU via a communication window, supporting 15 categories of core commands including pulse test output, configuration read/write, diagnostic information read, global output enable/disable, and datagram transmission. These functions satisfy the requirements for system debugging, configuration and operation control.

Supporting Components

Key Supporting Components

Redundancy Adapter: Model RH916QD (used for connecting redundant pair modules to the Terminal Assembly).
Terminal Assembly (TA): Available in multiple specifications including crimp type and ring terminal type. Certain models (e.g., RH917QZ) come with built-in bypass jacks and support the connection of I/A Series Output Bypass Stations (P0900HJ), facilitating output maintenance without interruption.
Wiring Cables: Offered in a variety of length specifications. Polyurethane cables (Type 1 P/PVC) have an operating temperature range of -20°C to +80°C, while Low Smoke Zero Halogen (LSZH) cables (Type 1 LSZH) feature an operating temperature range of -40°C to +105°C. Refer to Table 3 for specific model selection corresponding to cable lengths.

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