This standard specifies the DC current signal used to transmit information between industrial automation instruments (i.e., industrial process measurement and control system components). This standard applies to the specified signals used to transmit information between industrial automation instruments. This standard does not apply to information transmission within industrial automation instruments. GB/T 3369-1989 Analog DC current signals for industrial automation instruments GB/T3369-1989 Standard download decompression password: www.bzxz.net

UDC621.024-501.2:681.2
National Standard of the People's Republic of China
GB336989
Analogue direct current signals for industrialprocess measurement and control instruments Issued on March 31, 1989
Issued by the State Bureau of Technical Supervision
Implementation on April 1, 1990
National Standard of the People's Republic of China
Analogue direct current signals for industrialprocess measurement and control instruments GB3369-89
Replaced with GB3369-82
This standard adopts IEC381-1 "Analogue signals for process control systems Part 1: Direct current signals" (1982 edition). 1 Subject content and scope of application
This standard specifies the DC current signal used to transmit information between industrial automation instruments (i.e., industrial process measurement and control system components).
This standard applies to the specified signal used to transmit information between industrial automation instruments. This standard does not apply to the information transmission within industrial automation instruments. 2 Terminology
2.1 Industrial process measurement and control system components are functional units or combined devices that convert, process and transmit measured variables, master variables, controlled variables and reference variables, also known as industrial automation instruments.
2.2 Analog DC current signal
In industrial process measurement and control systems, a DC current signal that changes continuously within its range for transmitting information 2.3 Range of analog DC current signal
All values ​​of the analog DC current signal between certain limits 2.4 Lower limit bzxz.net
The lowest value of the specified range.
Note: The lower limit value can be zero or a finite value. If it is zero, it is called "true zero" and if it is a finite value, it is called "live zero". 2.5 Upper limit
The highest value of the specified range.
2.6 Load electronic control
The total resistance of all connected receiving instruments and connecting wires in the signal circuit. 2.7 Ripple content of DC current signal
The percentage of the peak-to-peak value of the AC component in the signal relative to the difference between the upper and lower limits of the DC current signal. 2.8 Signal common line
Some instrument input and output signal circuits may have a common electrical connection line, which is called the signal common line. It can be grounded or not.
3 Technical requirements
3.1 Range of analog DC current signal
Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on March 3, 1989 and implemented on April 1, 1990
The range of analog DC current signal is shown in Table 1. Sequence
Note: Priority value.
2) Non-priority value, which will be cancelled in the future.
G336989
Analog DC current signal range
Values ​​outside the analog DC current signal range
When using the analog DC current signal range priority value, the value outside the range "zero mA" is used as a signal circuit or power supply failure indication value.
3.3 Ripple content of DC current signal
The ripple content of the DC current signal should not exceed 3%. In the case of obtaining information from the instantaneous value of the signal (such as fast multiple 3.4 Signal common line
The signal common line should be at the lowest potential point of the signal circuit. If the signal common line is connected to the power supply, it should be connected to the negative terminal of the power supply or the zero volt terminal of the bipolar power supply.
3.5 Grounding
When the signal circuit needs to be grounded, the grounding terminal should be the negative terminal of the signal common line or the power supply or the zero volt terminal of the bipolar power supply. 3.6 Load resistance
A transmitter or control instrument should be able to continuously drive 0~3 Any load between 000 and 1000. Additional note: This standard is drafted by Chongqing Industrial Automation Instrumentation Research Institute. 2 National Standard of the People's Republic of China: Analog DC Current Signal for Industrial Automation Instrumentation GB3369--89 Published by China Machinery Industry Press (No. 1, Baiwan Zhengnanli, Fuchengmenwai, Beijing) (Beijing Book and Periodical Publishing Industry License No. 117) * All rights reserved
No reproduction
Printed in Qinghe County, Hebei Province
Published by the Machinery Standardization Research Institute of the Ministry of Machinery and Electronics Industry (No. 2, Shouti South Road, Beijing) #
Format 880×1230
Printing sheet: 3/8
Number of words: 4000
First edition in Beijing in December 1989·First printing in December 1989 Number of copies: 00.001-1000
Standardized book number 111-10704
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