HIMA Z7149 Fault safety relay module

Description

HIMA Z7149 is a fail safe relay module in the HIMA Z series, known for its reliability in Safety Instrumented Systems (SIS). As a key component of the ELOP II platform, it serves as a physical interface between electronic control signals (such as those from the HIMA F7000 series controllers) and mechanical relays, ensuring that safety instructions are executed with deterministic accuracy. Unlike standard relays, Z7149 has built-in diagnostic and hardware redundancy functions that can detect faults and maintain a safe state, complying with IEC 61508 and IEC 61511 standards.

Z7149

In terms of architecture, this module operates as a dual channel safety relay, with each channel independently monitoring the other for differences (such as coil faults, contact adhesion). The diagnostic coverage of this cross checking mechanism exceeds 99%, which is crucial for maintaining SIL 3 integrity. For integrators,Z7149 simplifies safety circuit design and reduces the need for customized redundancy solutions by providing pre certified fail safe functionality. Its compact DIN rail mounting design (width 40mm) and pluggable terminals further simplify installation in control cabinets, even in space limited environments.

The positioning of this module as a “safety first” relay solution is due to its ability to handle low voltage control signals (24 V DC) and high-power loads (250 V AC/30 V DC), making it suitable for various applications ranging from small machinery to large process control systems.

Z7149

Related products:
Dual channel redundancy (2oo2): Each channel consists of independent coils and contact groups, which are cross monitored through HIMA’s proprietary diagnostic logic. If a fault (such as an open circuit) is detected in one channel, the module will force both channels to a safe state (contact disconnection) and report an error to the controller.
High diagnostic coverage: The built-in testing circuit regularly checks for contact wear, coil integrity, and inter channel consistency to ensure compliance with SIL 3 requirements, suitable for safety critical applications.
Durable design: Operating temperature range of -25 ° C to+60 ° C, compliant with EMC standards (EN 61000-6-2/-6-3), capable of withstanding industrial environments with high vibration, electromagnetic interference (EMI), or temperature fluctuations. Its flame-retardant shell (UL 94 V-0) adds an additional safety layer in hazardous areas.
Flexible load handling: Supports normally open (NO) and normally closed (NC) contact configurations, with a maximum switching capacity of 5 A @ 250 V AC or 30 V DC. This makes it suitable for driving solenoid valves, motor starters, or alarm systems.
Hot swappable maintenance: Field replaceable units (FRUs) allow for channel level replacement without shutting down the system power, thereby minimizing downtime during routine maintenance or troubleshooting.

Z7149

Technical specifications:
Model HIMAZ7149
Brand HIMA
Type of Fault Safety Relay Module (SIL 3 Certification)
Power supply 24 V DC ± 20% (per channel)
Working temperature -25 ° C to+60 ° C
Installation method DIN rail (TS 35/7.5 or TS 35/15)
Dimensions 40mm (width) x 100mm (height) x 120mm (depth)
Weight 0.2 kg
Number of channels: 2 independent secure channels (2oo2 architecture)
Contact rating 5 A @ 250 V AC/5 A @ 30 V DC
Diagnostic coverage rate>99% (compliant with IEC 61508)
Certified IEC 61508 (SIL 3), IEC 61511, ATEX (Ex II 2G Ex db IIC T6 Gb), UL
Fault detection includes open circuit, short circuit, contact adhesion, and channel mismatch

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Z7149

Application areas:
In safety critical industrial environments such as refineries, chemical plants, and power generation facilities, HIMA Z7149is the cornerstone of fail safe automation systems. As a highly reliable safety relay module, it meets the basic requirements of isolation and protection critical processes by converting electronic safety signals into reliable mechanical relay outputs. For example, in natural gas processing plants,Z7149 ensures that emergency stop (ESD) commands from safety controllers can be reliably transmitted to pneumatic valve actuators, even in the presence of electrical noise or power fluctuations, and can operate normally.

In the manufacturing industry, this module is the core component of mechanical safety systems, used to manage interlocking devices for protective doors, emergency stop buttons, and robot unit protection. Its dual channel, fail safe design (2oo2 architecture) makes it an ideal choice for applications that require compliance with SIL 3 standards, such as automotive assembly lines or pharmaceutical filling stations, where any single point of failure can result in product loss or safety accidents. Engineers rely onZ7149 to bridge the gap between digital security logic and analog field devices, providing a robust, certified interface that can withstand harsh environments ranging from extreme temperatures in steel plants to high humidity in food processing plants.

Z7149

Related products:
HIMA F7553- SIL 3 Fault Safety Controller provides safety logic signals to Z7149 through hard wired connections or SAFETYBUS p.
HIMA Z7140- Single Channel Safety Relay Module, suitable for use with Z7149 as a non critical backup or simpler safety circuit.
HIMA X-DI1201- Digital Input Module, whose safety signals (such as emergency stop button) can be processed by F7553 and transmitted to the actuator through Z7149.
HIMA Z7240- Timer Relay Module, used in conjunction with Z7149, to achieve safety functions with time delay (such as blowing cycles before device startup).
HIMA F8627- Ethernet communication module, which can monitor the status of Z7149 channel through SCADA system for remote diagnosis.
HIMA Z7100- Basic Terminal Block, providing support for safe wiring of Z7149 in high vibration environments.

Z7149

Installation and maintenance:
Installation:
Wiring: Use shielded twisted pair cables as control signal lines to reduce electromagnetic interference (EMI) and separate power/load lines from low-voltage safety lines. For ATEX areas, ensure that wiring complies with intrinsic safety standards (such as twisted pair cables, limited capacitance).
Grounding: Connect the protective grounding (PE) terminal of the module to a dedicated grounding bus (<4 Ω) to prevent voltage spikes and ensure EMC compliance.
Configuration: Set the address dip switch of the module (if applicable) to match the channel mapping of the controller, and verify the contact status (normally open/normally closed) during pre commissioning testing.
maintain:
Monthly inspection: visually inspect for loose terminals, burnt contacts, or signs of overheating. Use HIMA’s engineering tools to view diagnostic reports to assess channel health status.
Annual testing: Conduct functional testing by simulating safety events (such as forced triggering channels) and verify relay actions and fault reports. If contact wear (such as pitting or oxidation) is detected, replace the contact.
Firmware update: Although this module is based on hardware, please ensure that the firmware of the connected controller is updated annually to support the diagnostic function of Z7149.

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