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S5-115U Manual
Further Functions at Interface SI 2
•
Point-to-point connection (master function)
•
ASCII driver
•
Integral clock
•
Computer link with 3964(R) procedure (only in the case of CPU 944 with the relevant oper-
ating system submodule for the purpose).
There are limitations on the simultaneous use of interfaces SI 1 and SI 2 of CPU 943 and CPU 944.
Depending on the status (activity) of an interface, certain requests from a PG/OP to the other
interface are not possible.
If this occurs, the function is aborted at the relevant interface by the operating system of the CPU.
An error message appears informing the user that the interface function is disabled.
This message draws your attention to the fact that the other interface is currently handling a
function which blocks the requested function.
Example: If "TEST STATUS" is active on SI 1, "BLOCK INPUT" is not possible at SI 2.
PG/OP functions are not possible at SI 2 if one of the following functions is active:
•
ASCII driver (CPU 943/944)
•
Point-to-point connection (master function in CPU 943/944)
•
Computer link (3964(R) procedure); in CPU 944 with relevant operating system submodule!)
4.5
Notes on the Use of Input/Output Modules
Digital Input/Output Modules
We offer floating or nonfloating modules to suit the different signal levels. The wiring of the
power supply, signal sensors and actuators is printed on the front flaps of the modules.
LEDs on the front side display the signal statuses of the inputs and outputs. The LEDs are assigned
to the terminals of the front connector (see also Chapter 15, "Technical Specifications").
Analog Input/Output Modules
See Chapter 10 ("Analog Value Processing") for information on the use of analog modules.
Note
Input/output modules can only be inserted or removed when the power supply for the
central controller and the signal sensors is switched off.
EWA 4NEB 811 6130-02b
PLC System Start-Up and Program Test
4-13
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