This standard specifies the nominal values of AC power supply voltage, frequency and DC power supply voltage for industrial automation instruments powered by external sources. This standard applies to industrial automation instruments. The tolerance of power supply voltage and frequency is specified by JB/T 9237.2-1999 "Industrial Automation Instrument Working Conditions and Power".
JB/T 8207-1999 history
1999JB/T 8207-1999 Supple voltages for industrial process measurement and control instruments