Status Indicators

Power - Red LED ON when power is ON
Inputs - Green LED ON when input is ON

Wiring Information

Terminal A1 -Shield
Connection is used as the shield / earth connection for the light curtain.

Terminals A2 and A3 – Power supply input
Connect a suitably stabilized 24V DC power supply to terminals A2 = +24V DC and A3 = 0V DC. The current consumption of the RY4B with no load applied on the output switching terminals is 200mA.

Terminal A4 and A5
Not internally connected to the box. They can be used with the T4 Series light curtain to provide the junction point for Mute 1 and Mute 2 input connections from the light curtain to the user.

Terminal A6
It is not internally connected. For T4 Series light curtain it is used as a junction point to provide the connection for the mute output signal to the user.

Terminal A7
It is not internally connected to the box. It provides a junction point for terminating the user reset station to the light curtain reset. If the light curtain and RY4B relay are to be configured in ‘auto-reset’ mode connect a 24V DC supply to this terminal instead of through a normally-open contact reset switch.

Terminals A8 and B8 – External device monitor(EDM)
Terminal A8 is an EDM input from the light curtain to the RY4B relay.

Terminal A8 is internally connected via N/C contacts of the internal relays to Terminal B8.

EDM is monitors auxiliary normally closed, force guide contacts primarily used for monitoring an external device (if required). E.g. contactors, safety relays (FSD) final switching device etc. There is a yellow LED associated with the EDM monitor that indicates the status of this circuit. may be used as an indicator for fault finding. LED ON = EDM Active.

Terminals A5 and A6 – Safety Inputs
Relay coil inputs to be connected to the device which will energize the internal force guided relays by applying 24V DC. A5 (Receiver Pink wire) and A6 (Receiver Grey wire) may be used for a light curtain input (OSSD1 and OSSD2) e.g. T4 series safety light curtain.

Terminal A7 and B7
Are internally connected contacts and may be used as link terminals. When using the T4 Series light curtain A7 is used to connect the data link from the Receiver head, transmit signal . B7 is used to connect the data link from the Transmitter head, receive signal.

Terminal A8 and B8
Are internally connected contacts and may be used as link terminals. When using the T4 Series light curtain A8 is used to connect the data link from the Receiver head, transmit signal . B8 is used to connect the data link from the Transmitter head, receive signal.

Terminal A9 and B9 – Auxiliary Output
Auxiliary normally-closed relay contact output (non-safety) 250V, 6A.

Terminals A10 and B10 – Safety output 1
Connect terminals A10 and B10 to one channel of the machines stop circuitry, for example, via an external power-switching relay, directly to a safe PLC input or a machines final control element. Normally open contact rated 250VAC@6A.

Terminals A11 and B11 – Safety output 2
Connect terminals A11 and B11 to one channel of the machines stop circuitry, for example, via an external power-switching relay, directly to a safe PLC input or a machines final control element. Normally open contact rated 250VAC@6A.

Terminals A12 and B12 – Safety output 3
Connect terminals A11 and B11 to one channel of the machines stop circuitry, for example, via an external power-switching relay, directly to a safe PLC input or a machines final control element. Normally open contact rated 250VAC@6A.

Terminals B1 – Shield - Shield

Terminals B2 – 24V DC supply -24V DC supply

Terminals B2 – 0V DC supply - 0V DC supply

Terminal B4
Is not internally connected. This terminal is used to connect the data from the receiver head transmit signal (blue wire) and the data from the transmitter head receive signal.

Terminals B5
It is internally connected to the auxiliary relay coil input, which will energize the internal status relay (Non safety) by applying 24V DC. When using the T4 Series light curtain the status output from the light curtain is connected to this terminal to drive the auxiliary relay.

Terminals B6
It is not internally connected. This terminal is used to connect the data from the receiver head receive signal and the data from the transmitter head transmit signal.

Terminal B5 and B9 - Safety relay coils
Safety relay coil inputs to be connected to the device which will energize the internal force guided relays by applying 24V DC. B6 and B7 may be used for a light curtain input (OSSD 1 and OSSD2), e.g. T4 series safety light curtain.