EUCHNER MSC, Operating Instructions, Installation And Use

Page: 153 / 174

153
2121331-04-04/19 (Translation of the original operating instructions)
Operating Instructions
Modular Safety Control System MSC
EN
9.5. Other function blocks
9.5.1. Serial output (SERIAL OUTPUT) (max. number = 4)
Using the SERIAL OUTPUT operator the status of up to 8 sensors is
output; the data are output in series.
Principle of operation
Using this operator the status of all inputs connected is output in two
different ways:
Asynchronous serial output:
1. The status on the cable when not in use is "1" (TRUE).
2. The start data transfer signal is 1 bit = "0" (FALSE).
3. Transfer of n bits, where the status of the inputs connected is
Manchester coded:
Ì Status 0: rising signal edge in the middle of the bit
Ì Status 1: falling signal edge in the middle of the bit
4. Intercharacter interval is "1" (TRUE) to make it possible to synchro-
nize an external device.
For this reason the Clock output is not available with the asynchronous
method.
Synchronous serial output:
1. Output and Clock are "0" (FALSE) when not in use.
2. Transfer of n bits, where the input status is coded with OUTPUT
as data and CLOCK as timebase.
3. Intercharacter interval is "0" (FALSE) to make it possible to syn-
chronize an external device.
Figure 184: Serial output
Figure 185: Asynchronous serial output
0 1 1 0 1 0
Output
Clock
Figure 186: Synchronous serial output
Parameter
Inputs number: Defines the number of inputs on the function block. These can be 2 to 8 (asynchronous) or 3 to 8 (synchronous).
Bit duration (ms): In this field you can enter the value that corresponds to the duration of the individual bits (input n) in the
pulse sequence that comprises the transmission.
Ì 40 ms – 200 ms (10 ms step)
Ì 250 ms – 0.95 s (50 ms step)
Intercharacter duration (ms): Enter in this field the time that must elapse between the transmission of one pulse sequence
and the next.
Ì 100 ms – 2.5 s (100 ms step)
Ì 3 s – 6 s (500 ms step)