![Siemens S5-135U Скачать руководство пользователя страница 247](http://html.mh-extra.com/html/siemens/s5-135u/s5-135u_system-manual_377341247.webp)
5-107
System Manual
C79000-G8576-C199-06
The TTY submodule feeds in the current (20 mA) via jumpers in the
connector of the standard connecting cable. The 24 V required for generation
of loop current is taken from the power supply of the PLC. In the quiescent
state, with a correct loop current connection, there should be a flow of 20 mA
(= logic 1). When the current is interrupted there is a logic 0.
The following applies to the TTY signals:
Logic 0 is represented by: no current
Logic 1 is represented by: current (20 mA)
A maximum of 9600 bps is permissible for data transmission with the TTY
submodule.
Shown in the figure are the pin assignments of the 25-pin subminiature
D-type connector in the front plate of the TTY submodule:
13
Pin
Designa-
tion
Current
direction
Remarks
25
13
1
Shield
9
24 V
external
This connection is changed over between
24 V internal and 24 V external with
jumper J3 (see next page).
10
+ TxD
²
12
+ 20 mA
³
Current source, transmitter
13
+ RxD
²
14
– RxD
³
14
1
16
+ 20 mA
³
Current source, receiver
1
19
– TxD
³
21
– 20 mA
²
Current return
24
– 20 mA
²
Current return
²
: Input
³
: Output
Data Transmission
Rate
Pin Assignments
of the TTY
Submodule
CPUs, Memory Cards, Memory Submodules, Interface Submodules
Содержание S5-135U
Страница 10: ...x SystemManual C79000 G8576 C199 06 Contents ...
Страница 18: ...1 8 SystemManual C79000 G8576 C199 06 Notes on Using this Manual and on the CE Symbol ...
Страница 26: ...2 8 SystemManual C79000 G8576 C199 06 Centralized and Distributed Configuration of a Programmable Controller ...
Страница 66: ...3 40 SystemManual C79000 G8576 C199 06 Installation Guidelines ...
Страница 496: ...9 114 SystemManual C79000 G8576 C199 06 Analog Input Output Modules ...
Страница 536: ...11 24 SystemManual C79000 G8576 C199 06 Connector Assignments ...
Страница 558: ...Index 8 SystemManual C79000 G8576 C199 06 Index ...