ABB AC 800F Mounting And Installation Instructions Manual page 366

13
- T -
TCP/IP
TDR
Terminal
Terminal block
Terminal emulation
Test voltage
Time Domain Reflectometer
(TDR)
Toggle (switch)
Transceiver (10Base2)
Transceiver (AUI)
Transceiver (optical)
Transfer element
*)
Component of the Freelance 2000 System
Transmission protocol for Ethernet system bus. In accordance with layers
2 to 4 of the ISO/OSI seven-layer model.
→ Time Domain Reflectometer
Display terminal with serial RS232C interface. Usable for diagnosis as an
alternative to a PC with terminal emulation. Control sequences in
accordance with ANSI standard, therefore often called "ANSI terminal".
Used for connecting the communication cables of fieldbus modules
FI 820F and FI 810F through a TK 821F or TK 831F cable. Additionally,
the bus termination and the internal wiring with the field devices are
realized via terminal block TB 870F.
Runs on a PC. The terminal emulation used for Freelance 2000 is
included in the scope of delivery of MS Windows NT.
→ Terminal.
Voltage applied to a module during the type acceptance test or the final
quality control of manufacturing to check the insulating capability of the
module. The test voltage is a multiple of the rated voltage value.
→ Rated voltage value
Instrument for measuring cables. The TDR transmits a short electrical
impulse into the cable and then records the time sequence of the
reflected signals on a screen.
If the cable is all right, there is only a reflection at the open cable end.
Cable kinks, cable breaks, and T-connectors with improper characteristic
impedance cause further reflections, which can be seen on the
measuring record. The cable length can also be determined by means of
the impulse propagation time. Therefore, the TDR is also suitable for
detecting short circuits and cable breaks.
An optical time domain reflectometer (OTDR) is used for fiber optic
cables. The OTDR works with light pulses instead of electrical pulses.
Apart from this it has the same functionality as the TDR.
Push-button for toggling between two AC 800F operating in redundancy
mode. Only active on the Primary. When this switch is actuated, a
redundancy alignment takes place, and the primary AC 800F becomes
the secondary one, which in turn becomes the primary AC 800F and
takes over process control
Transceiver for connection to a 10Base2 network cable. Used, for
example, for a PC which has only an AUI connector but is to be
connected to a 10Base2 segment.
AUI is an abbreviation of Attachment Unit Interface. When using a
10Base5 network cable (Yellow-Cable), a 10Base5/AUI network
transceiver and an AUI network cable are needed for connecting the
node to the network cable. The 10Base2 network transceiver can also be
used for connecting a node via the AUI interface to a 10Base2 network
cable.
→ 10BaseFL transceiver
→ Terminal block TB 870F
Glossary
13-15