Siemens S5-135U/155U appendix TTY Submodule, TTY submodule can be inserted in the following CPU

Models: S5-135U/155U

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CPUs, Memory Cards, Memory Submodules, Interface Submodules

5.11.4TTY Submodule

The TTY submodule is for use with the RK 512 computer link, data transmission with procedures 3964/3964R, data transmission with the ªopen driver.º

The TTY submodule complies with DIN 66 258, Part 1.

Application

The TTY submodule can be inserted in the following CPU:

Interface Submodule ...

For Use With ...

TTY submodule

CPU 928B CPU 948

Circuitry

The TTY submodule is equipped with a transmitter and receiver for 20 mA

 

current loop signals. Shown in the following figure is the typical circuitry for

 

current loop signals.

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Transmitter

Receiver

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Receiver

Transmitter

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Current Direction Arrows

Figure 5-20 TTY Submodule: Loop Current Direction

The loop current can be fed in both by the TTY submodule and by the partner station. Only the side supplying the current is non-floating.

!

Caution

With longer line lengths, you should arrange your line so that the transmitter always supplies the current.

5-106

System Manual

C79000-G8576-C199-06

Page 246
Image 246
Siemens S5-135U/155U appendix TTY Submodule, TTY submodule can be inserted in the following CPU, TTY submodule CPU 928B CPU