Reer MZERO Installation, Use And Maintenance Manual page 101

Condition 2:
With reference to the Figure 42 and Figure 43, when the emergency stop is pressed in one of the four nodes:
1.
The Net_out moves to condition 0 (FALSE);
2.
The STOP signal is sent via the Net_out line;
3.
The next node receives the stop code and deactivates the output;
4.
The stop command generates the stop code for all Net_in and Net_out lines;
5.
As the end result,
6.
When the emergency stop is restored to the normal position, all the nodes can be restarted by
sending the START signal with a single reset. The latter condition does not occur when ENABLE RESET
NETWORK is not enabled. In that case, the local reset method must be used. The system will employ
about 4s to restore all the outputs of the blocks that make up the network.
➔
Perform a local reset of the module which caused the network shutdown, to restore its
safety output.
Response Time
The max response time of the network starting from emergency stop is given by the formula:
Emergency Stop Pressing
MZERO
Condition 3:
With reference to the Figure 40 and Figure 41, when the IN input of the NETWORK function block of one of the
4 nodes moves to condition 0 (FALSE):
1.
The local OUTPUT moves to condition 0 (FALSE);
2.
The RUN signal continues to be sent via the Network_out lines;
3.
The states of the remaining nodes remain unchanged;
4.
In that case, local reset must be used. The Reset-in LED flashes to indicate this condition.
This condition is signaled by the corresponding LED flashing Reset_In entrance.
The affected node will be restarted with its own reset (if 'Reset Global Reset' is not selected).
The Network_in input and the Network_out output can only be mapped to the I/O pins of the MZERO.
8541403 • 19/07/2021 • Rev.1
STAND ALONE PROGRAMMABLE SAFETY CONTROLLER
the Net_out of all the connected nodes is in condition
MZero t = 22 ms + [186ms x (number of controllers – 1)]
r
MZERO n°1
t
rMZERO1
22 ms
MZERO
4
MZERO n°2 MZERO n°3
t t
rMZERO2 rMZERO3
208 ms 394 ms
MZERO
1
MZERO
MZERO
3
0 (FALSE).
MZERO n°4
t
rMZERO4
580 ms
2
101