Network (Max Number = 1) - Reer MZERO Installation, Use And Maintenance Manual

NETWORK (max number = 1)

The Network operator is used to distribute Stop and
Reset commands via a simple local network. Use
Network_in and Network_out to exchange START,
STOP and RUN signals between the different nodes.
Operating principles.
This operator allows stop and reset commands to be
simply distributed in a local MZERO network.
The Network operator requires the following:
1) the Network_In input (single or double) must be connected to the Network_Out output of the
preceding unit in the local network.
2) the Network_Out (could be a STATUS or OSSD output), must be connected to the Network_in
input of the next unit in the local network.
3) the Stop_In and Reset_In inputs must be connected to input devices that act as Stop (e.g. E-STOP)
and Reset (e.g. SWITCH), respectively.
4) the In input can be connected freely in the diagram (e.g. input function blocks or results of logical
combinations).
5) Output can be connected freely in the diagram. Output is 1 (TRUE) when the IN input is 1 (TRUE)
and the function block has been restarted.
Parameters
Enable Reset Network: when selected allows the distribution network to reset the function block. If not
enabled, the function block can only be reset via the local Reset_In input.
Enable error out: if selected, it enables the Error_Out output that can be used to signal, with a logic 1
(TRUE), the presence of a failure.
Global Reset Enable: if selected, the operator can restart the entire system with the reset button from any
node in the network. If deselected the operator can restart all the nodes that have been not caused the
stop from anywhere in the network, except the node that has caused the stop (this node has to be restarted
with its own reset).
Stop cause: if selected, it enables the Network_stop and Local_stop outputs and indicates the cause of
the STOP status. These outputs are normally at 0 with the system in RUN and the Output at 1 (TRUE). If a
network stop is requested, the Network_stop output increases to 1(TRUE). If the Output output goes to 0
due to the In input or the Stop_in input, the Local_stop output goes to 1 (TRUE). The outputs will remain in
this status until the next main reset.

The RESET command must be installed outside the zone of operation in a position where the
zone of operation and the entire work area concerned are clearly visible.
➔
The maximum number of MZERO modules that can be connected in network configuration is
equal to 10.
Condition 1:
With reference to the Figure 42 and Figure 43, at power-on:
1. The Net_out of the various nodes are in the 0 (FALSE) condition;
2. The STOP signal is sent via the Net_out line;
3. When the RESET command is pressed on one of the nodes all the nodes that are present
are started when the START signal is sent;
4. As the end result, the Net_out of all the connected nodes is in condition 1 (TRUE) if the
various Net_in inputs are in condition 1 (TRUE);
5. The RUN signal is sent via the network of the 4 nodes present.
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STAND ALONE PROGRAMMABLE SAFETY CONTROLLER
8541403 • 19/07/2021 • Rev.1