Overview
Manuals
Application
Safety Considerations
Features:
- Fault tolerant operation when connected in parallel with another module of the same type
- Fuses accessible from front panel
- 2500 minimum electrical isolation between field and logic circuits
Monitored Guarded output modules provide Guarded control and line monitoring for sixteen field loads. Three types of modules are available for interfacing to outputs powered from 24 VDC, 110 VAC, or 120 VDC field power supplies. These modules are called Guarded because each module's dualredundant design ensures that no single fault within the module will inadvertently apply power to an output.
These modules also monitor the output field wiring for open and short circuit faults. Individual output line status is available to application programs. Each module's triplicated Safetybus interface ensures that no Regent system failure will inadvertently apply power to an output. Extensive fault detection and redundant critical circuits ensure that each module operates in a fail-safe manner.
The T7481 ICS Triplex Monitored Guarded Outputs may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
ICS Triplex T7481 Monitored Guarded Output Module maunal(Datasheets), Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Monitored Guarded digital output modules provide a suitable interface to safety-critical output devices. These safetycritical devices typically include solenoids, actuators, or other process interlock outputs. Monitored Guarded output modules can be used for fail-safe or fault tolerant operation.
Fail-Safe Configuration
Fail-safe configuration uses a single monitored Guarded output module. In this configuration, the worst case failure will cause the output to fail to the off state. In a fail-safe configuration, removing the module disables all outputs.
Fault Tolerant Configuration
For fault tolerant operation, two monitored Guarded output modules are connected in parallel. In this configuration, operation continues even if one module fails. In the fault tolerant configuration, a failed module can be removed and replaced without interrupting operation of the loads.
Fault Tolerant Configuration with Redundant Actuators
When redundant actuators are installed in the field, the level of fault protection can be extended to include the field wiring and actuators. Each actuator should be connected to an individual monitored guarded output module. In this configuration continuous operation can be maintained even if a module, field wiring or load fault occurs.
The Monitored Guarded output modules are TÜV certified to Risk Class 5 for safety critical outputs. The modules are approved for de-energize to trip safety critical outputs in single or dual module configurations.
The modules are also approved for energize to trip safety critical outputs in dual module configuration, but only if the fault name variables are configured and used to automatically alarm and annunciate the detection of load/fuse faults to plant operations personnel.
