FANOX SIL-A, Installation & Commissioning Manual, Page: 17 / 36

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6. PROGRAMABLE LOGIC CONTROL
Firstly, it is defined the concept of physical input, physical output and logical signal.
Physical inputs are the real inputs of the device. SIL-A device has physical inputs (6 inputs).
These inputs are translated to internal binary states which later, can be assigned to logical
signal to get a specific operation.
Physical outputs are the real outputs of the Device. SIL-A has 4 outputs and up to 8
configurable leds, which receive the same treatment as the physical outputs, some working on
output relays and others working on led diodes.
Logical signals are internal binary states resulting from control programmable logic. Each logical
signal has a specific meaning and is intended to be used by the functions of the device.
SIL-A Adaptation B SIL-A Adaptation C
LEDs
LED 1
LEDs
LED 1
LED 2 LED 2
LED 3 LED 3
LED 4 LED 4
LED 5 LED 5
LED 6 LED 6
LED 52 LED 52
LED 79 LED 79
PHYSICAL OUTPUTS
Output 1
PHYSICAL OUTPUTS
Output 1
Output 2 Output 2
Output 3 Output 3
Output 4 Output 4
LOGICAL SIGNALS
52a
LOGICAL SIGNALS
52a
52b 52b
External Trip External Trip
50BF Start (*) 50/51 Block
DFR Start 50/51N/G Block
79 Start Settings group 1
79 Enable Settings group 2
79 Level Block Reset
79 Block 79 Start
79 Unblock 79 Enable
Block 50/51 79 Level Block
Block 50/51N/G 79 Block
Reset 79 Unblock
Settings group 1 DFR Start
Settings group 2
74TCS Continuity A
74TCS Continuity B
Logic Signal 1
Logic Signal 2
For each output, there is a LOGICAL GATE. It can perform a logical operation up to 4 binary
states to obtain other binary result. In V3 of the PLC the LOGICAL GATES that are supported
by SIL-A are: