The Yokogawa ALR121-S51 is a relay board used in the ADV161 process control system. It is a dual-redundant digital input/output module, which means that it has two sets of relays that can be used to control or monitor external devices. The ALR121-S51 is out of scope of the Safety Standards, which means that it is not certified for use in safety-critical applications.
The ALR121-S51 has the following features:
- 16 single-pole, double-throw (SPDT) relays
- 24 VDC coil voltage
- 5A contact rating
- DIN rail mounting
The ALR121-S51 is used in a variety of applications, including:
- Process control
- Factory automation
- Building automation
- Power generation
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