Rockwell Automation Allen-Bradley MobileView 2711T-VMBRACKET, Руководство пользователя, Страница: 18 / 104

18 Rockwell Automation Publication 2711T-UM001E-EN-P - March 2019
Chapter 2 Safety Precautions and Elements
Figure 3 - Enabling Switch Wiring Example for a First Generation MobileView Terminal Connected
to an IP20 Junction Box
• Only if both channels (CH1 and CH2) of the enabling switch are
activated ‘simultaneously’ do output contacts 13-14 and 23-24 close, and
output relays K1 and K2 energize.
• The output relays K1 and K2 do not energize if:
– Only one enabling channel is activated.
– The tolerance value for the simultaneity period is exceeded.
– The feedback control loop at S34 is open.
• If one enabling channel is released after being simultaneously activated, the
forced-guided output contacts 13-14 and 23-24 open, and output relays
K1 and K2 return to their initial position. The output relays only energize
again after both enabling channels have been released and operate
simultaneously again.
In this way, the enabling switches avoid the one single error that makes the
safety function inoperable. At the least, one error is recognized at the next
cycle.
CH1
CH2
1 2 7 8 9 10
1 2 7 8 9 10
1 2 7 8 9 10
+24 V
+24 V DC
External Switched
Stop/Start Circuit
L11
A1 A2
S11
S21
Reset
0
MM
AM
Y32
S12
S22
S34
13 14
23 24
A1
A1
A2
A2
GND ED1+ ED1- ED2+ ED2-
X4
S1
M
X1
3
4
6
7
8
5
2
1
K1
K2
K1
K2
K2 K1 100S-C09EJ23BC
100S-C09EJ23BC
L1 L2 L3
Table 3 - Callouts
Item Description
1 MobileView 2711T terminal
2 Enabling switches circuit board
3 Connection cable wires
4 Junction box input connection
5 Control cabinet
6 Junction box terminals
7 Allen-Bradley Guardmaster®
safety relay
8 3-phase motor
Table 4 - Actuating Elements
Item Description
Voltage, nom 24V DC (typical)
30V DC (max)
Current, nom 500 mA (typical)
Inductive load, max 700 mA (DC13)