Safety Function Architecture
The BMXSDI1602 module internal architecture performs the safety function as follows:
1 The measuring devices are continuously monitored for their ability to measure a "1" and a "0".
2 The external 24 Vdc power supply is continuously monitored by the safety processor. Each input value is acquired by two identical circuits. The acquired values are compared by the safety processor. If values are different, the channel is declared not valid.
3 The supply voltage from the backplane is monitored to detect an over or under voltage condition.
4 The companion chip supplies the safety processor, continuously diagnoses the safety processor, and monitors backplane voltage.