6. Redundancy with NX3030 CPU
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ï‚· RL A: 2 terminals connected to a relay NO (normally open) contacts, which can be commanded
by PLCB to switch off PLCA. This relay must be closed by PLCB in order to switch off PLCA;
ï‚· RL B: 2 terminals connected to a relay NO (normally open) contacts, which can be commanded
by PLCA to switch off PLCB. This relay must be closed by PLCA in order to switch off PLCB.
A CPU (PLCA or PLCB) can turn off the other CPU (PLCB or PLCA) in some exceptional
situations, using the NO relays in the RLA and RLB connectors. Such situations are described in the
Transition between Redundancy States section
The PX2612 has also 6 buttons for redundancy command and 6 LEDs used for redundancy state
indication. Each CPU reads 3 from these 6 buttons and controls 3 LEDs.
For further information regarding these buttons and LEDs functions, see PX2612 Redundancy
Command Panel Functions section.
Figure 6-4. Redundancy Control Panel PX2612
Figure 6-5. Redundancy Control Panel PX2612 Frontal View
PX2612 Features
The redundancy control panel PX2612 has the following features:
ï‚· CONTROL PLC A: connection to the module NX4010 from PLCA
ï‚· CONTROL PLC B: connection to the module NX4010 from PLCB
ï‚· RL A: relay NA terminals used to switch off PLCA
ï‚· RL B: relay NA terminals used to switch off PLCB
ï‚· GND: grounding
Other features (generals, electrical, mechanic and environment) are presented in the Redundancy
Control Panel PX2612 Technical Features - CT112500.
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General