SDKELI BLPS-D3L - Sensor and ST Controller Used Together

- 23 -
2.2.2 Monitoring function
 Monitoring the state of sensor
BLPS monitors the state of the detecting beams and outputs safety control signals according
to the operating mode and the detecting results Such as: in the protection trip, if the effective
detecting beam is shaded, the OSSD outputs are on the OFF-state.
 Fault detection and indication
Detect the failure of controller and sensor, turn the OSSD outputs to the OFF-state when any
failure in the above table occurs, and indicates the error at the same time. The system returns
to normal state only after the failure is removed.
 Monitoring the state of relay which controls the fast down stroke of the bender
Monitor the NC contacts of relay which controls the fast down stroke of the bender, contrast
the state of NC contacts with the state of fast down output signal, and cut off the fast down
output when the internal relay signal is inconsistent with the slow down logic signal of the
external relay.
NOTE: This function is only offered by SP controller.
 Monitoring the state of relay which controls the slow down stroke of the bender
Monitor the NO contacts of relay which controls the slow down stroke of the bender, contrast
the state of NO contacts with the state of slow down output signal, and cut off the slow down
output when the internal relay signal is inconsistent with the slow down logic signal of the
external relay, the system enters fault state at the same time.
NOTE: This function is only offered by SP controller.
2.2.3 Safety output
 OSSD outputs of sensor
Sensor of BLPS can be used with the bender separately and each of the detecting beams can
provide two independent control outputs in the form of PNP.
The sensor outputs ON-state with the high level voltage when the detecting beam is on the
light-passing state.
The sensor outputs OFF-state with the low level voltage when the detecting beam is on the
light-shaded state.
When the detecting beam of sensor is on light-passing sate, the corresponding OSSD outputs
ONstate; if blocked, the corresponding OSSD outputs OFF-state. OSSD automatically turns
to ON-state when the object which blocks the beam is removed. When the OSSD output
circuit is on fault state or short circuit with other interface signals, all OSSD outputs of the
sensor enter OFF- state and being locked.
 OSSD outputs of controller
Two groups of safety relay contact signals (13/14 and 23/24).
A set of Type4 safety circuit is built by the safety relay and control circuit together to monitor
the consistency state of safety relay contacts to prevent output error caused by adhesion of the
relay contacts.
 Slow down control output
One group of ordinary relay contact signals (33/34).
A set of safety circuit is built by the ordinary relay and control circuit together to monitor the
consistency state of safety relay contacts to prevent output error caused by adhesion of the
relay contacts.