Operation - Stahl 9170 Serie Betriebsanleitung

Operation

EN
8 Operation
EN
EN
8.1 Operation
EN
Operating principle
EN
The switching repeater assesses a digital signal from an intrinsically safe circuit. It transmits
EN
the switching state of its input to the output. Various output variants with signal relay,
power relay or electronic output are available.
EN
EN
The switching repeater checks if there are line faults (wire breakage and line short circuit)
EN
in the electrical lines between the switching repeater and field device. If an error is detected,
this will be output in the form of a collective error message. The corresponding switching
EN
outputs enter a de-energised state. Type 9170/.1-14-12 features line fault transparency.
EN
This function allows the message regarding the line faults to be transmitted to the
downstream control level directly via the signal channel.
EN
EN
Operating states
EN
Input
EN
EN
EN line fault detection LF = deactivated (LF1/2 = "OFF")
Initiator
EN
high-impedance/
EN
contact is opened/
EN
wire breakage
EN Initiator
low-resistance/
EN
contact is closed/
EN
short-circuit
EN
line fault detection LF = activated (LF1/2 = "ON")
EN Wire breakage
Initiator
high-impedance /
contact is opened
Initiator
low-resistance /
contact is closed
Short circuit
The types 9170/.1-14-12 transmit the input signals at the output in a different way than
the way described in the table above (see Chapter 6.2.1).
12
Switching repeater
Series 9170/.1
Signal
I ( 1.2 mA
E
I ) 2.1 mA
E
I ( 0.05 to 0.35 mA
E
I = 0.35 to 1.2 mA
E
I = 2.1 to 5 mA
E
R < 100 to 360 Ω
E
Output state in case of
"inverted direction of action" (INV1/2)
OFF
Relay is not
energised/
electronic output
blocks
Relay is energised/
electronic output
conducts
Relay is not
energised/
electronic output
blocks
Relay is not
energised/
electronic output
blocks
Relay is energised/
electronic output
conducts
Relay is not
energised/
electronic output
blocks
ON
Relay is energised/
electronic output
conducts
Relay is not
energised/
electronic output
blocks
Relay is not
energised/
electronic output
blocks
Relay is energised/
electronic output
conducts
Relay is not
energised/
electronic output
blocks
Relay is not
energised/
electronic output
blocks
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2020-04-30·BA00·III·en·09