Appendix H Component Details – Standard Models
344
Sensor Boards
The Sensor Board is connected to the 16-conductor Detector Serial Interface cable. It
contains input connections for several sensors and switches, and outputs for
annunciators (Fault, Ready, Wait, etc.) and relays.
CAUTION:
Remove power before (dis)connecting cables to or
from the Sensor Board.
A variety of sensors, including infrared motion sensors and photoelectric sensors, are
used to detect the approach and correct positioning of personnel being monitored.
The Sensor Board model number can be identified by the number stamped on the
board.
The Sensor Board contains input connections for all sensors and switches, and
outputs for annunciators (Fault, Ready, Wait) and relays. They are installed on the
Detector Serial Interface bus. To accommodate future new board versions that might
have differing software requirements, Sensor Boards have computer-readable model
identifications (IDs). The Sensor Board model number can be determined from the
ID displayed on the F6 – Sensor Board Tests screen, which is accessed from the
F2 – Test Menu (on page 205) or, if applicable, the Shift+F2 – Additional Test Menu
(on page 213) or from the Board Marking stamped on the board, as shown in
Table 34 and Table 31 on page 339. All serial bus monitors make use of the 4-Relay
Sensor Board (SCN 816540). Other boards are available depending on Model and/or
Options ordered (see Appendix I Component Details – Options).
Table 34 Sensor Board Id Markings and SCN
ID Board Marking SCN Model Info. Board Type
2 B216542 and 216540 816540 All Four-Relay Sensor Board
Four-Relay Sensor Board (SCN 816540)
Note: Since this board is used in many other contamination monitors,
some of the functions shown may or may not be used or required.
An FPGA chip has been programmed with control logic to recognize commands sent
to the board and to generate all necessary strobe pulses.
The Detector Serial Bus Interface is made via the Command and Data line
transceivers. Interface connectors J1, J2 are 16-pin ribbon-cable connectors (see
Table 31 on page 339 for signal descriptions). The Sensor Board includes local
+1.5V, +3.3V and +5 V regulators, which are powered from +12V bus power line.
The annunciator drivers contain the annunciator state register and the buffer
transistors Q1, Q2, Q3, Q4, which directly drive the annunciator connectors TB1,
TB7 TB2 and TB8. Connectors TB2 and TB8 (connected in parallel) provide power
to the FAULT and READY annunciators while TB1 and TB7 (connected in parallel)
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