The transfer transceiver will typically be used where contiguous fail-safe control of a long conveyor e-stop system is required. It enables conveyors up to 24km in length (2 x 12km Ringline systems) to be safely controlled.
The interlocking of systems is achieved using the RL6XFR in conjunction with the Cat 4 Digital transmitter. The Cat 4 transmitter is connected to the outputs of the safety card via an auxiliary on the contactor (see Figure 4). If the Cat 4 is programmed to transmit on the last Ringline address the Transfer Transceiver will reproduce this status on the 4th last address on the remote Ringline
If we do the same on both sides of the transfer transceiver we have provided an easy way of sending the safety card status from one Ringline system to the other. If we set up the block mask on each safety card to include the 4th last address we have now interlocked the safety cards on either side of the transfer transmitter; if one system trips the other will immediately follow. We should note the redundancy that is achieved by this arrangement; in particular, the transfer of two redundant safety outputs and their compliment state, to ensure proper operation of the safety function with a single failure in either the Ringline control system, the field-bus or the transfer transceiver.