Procom 4IOS - Manual (Page 4)

Data Sheet
4IOS
Multifunction I/O Module
The two opto-couplers have a common “minus” connection.
The first opto-coupler takes directly the “plus” of its input in a current-
limiting way; for the second the input voltage is also debounced (a few
ms). Besides this a switch threshold of approx. 5 V is specified through a
Zener diode.
This input is used as a rule for low frequency (LF) monitoring.
To realize diverse tasks, switching can be done into 5 different modes of opera-
tion per functional group (set), with the help of the ICS software.
“Standard” Operating Mode
In the mode of operation “Standard” all I/O channels are freely configurable
through the ICS software and independent of one another. Here relay outputs
are switched or opto-coupler inputs queried through sending and receiving of
DVS-21 line frames.
Modes of Operation for Secured Status Transmission
- Secure Sender
- Secure Receiver:
- Secure Receiver (inv.)
If transmission of status information over several systems requires additional
security for the internal DVS-21 hardware and data transmission data link layer
then 2 units of 4IOS groups (sets) can be coupled together. In this way an addi-
tional data link layer is established between the two sets in which security re-
lated statuses can be received, transmitted and outputted again.
For this the mode of operation “Secure Sender” is assigned to the source and
the mode of operation “Secure Receiver” to the target, or in the case of low ac-
tivity output, the mode of operation “Secure Receiver (inv.)”.
The secure sender transmits in cyclical intervals (times can be configured in the
ICS software) two further verification elements (line frames) in addition to the ac-
tual status information.
If, in the case of error, the verification elements do not arrive at the target then
when a configurable time expires the status output including the last status are
frozen and a line error is signalled.
If the verification elements are properly received at the target, but the status in-
formation not verified, then every time the verification elements are received a
transmission error will be signalled.
Only after proper reception as well as verification of the verification elements
and status information will the error signals be reset.
Only verified status information will be outputted.
Date: 13.03.2009 Page: 4/8 Author: HS Document-No.: DB_4IOS_2804_01
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