Siemens TC12 Installation, Commissioning And Maintenance Handbook page 82

3.2.3.5 Input/Output Cable
Connect the Input/Output Cable (part number 667/1/22693/000) to 40-way
connector PL2 and 34-way connector PL4.
Note. When pushing the connectors into PL2 and PL4 the OTU PCB must
be supported from underneath to stop the board from bending and
possible damage being caused.
Refer to Drawing 667/GA/22693/000 for wire colours of particular inputs and
outputs (inputs are labelled R1, R2, etc. and outputs are labelled C1, C2, etc.).
Figure 25 and Figure 26 show the pin out of the input connector (PL2) and (PL4)
on the PCB.
Outputs - Each output has two wires. It does not matter which way round these are
connected. Outputs 1 to 8 and Transmit Confirm (labelled TC) extend from the
thicker multi-core cable (labelled 11 on the drawing). Outputs 9 to 16 extend from
the thinner multi-core cable (labelled 10 on the drawing).
Inputs - Inputs 1 to 8 extend from the thicker multi-core cable (labelled 11 on the
drawing). Inputs 9 to 16 extend from the thinner multi-core cable (labelled 10 on
the drawing). The ground for each of these 16 inputs is wired as follows:
A white wire from the thicker multicore cable is paired with one end of a looped
white wire. This pair of wires should be connected together to provide the ground
for one of the inputs. Fifteen other input grounds are formed by the looped white
wire.
Individual wires provide inputs 17 to 24 directly from the 40-way Berg connector
(Refer to cable drawing). These inputs are for use with the detectors. A single
white ground wire is included with the individual wires from the 40-way connector.
This should be wired to the input ground of the first detector and 'daisy chained' to
the other detectors.
Individual wires also provide inputs 25 to 32 directly from the 40-way Berg
connector (Refer to cable drawing).
Inputs on 40 way connector PL2 are also used to connect voltage sensors when
these are required for lamp monitoring (see section 3.2.5).
The inputs conform to MCE0141, i.e. an impedance of less than 250 ohms to
ground will deactivate the input and an impedance of greater than 100K to ground
will activate the input.
666/HE/43100/000
TC12 Installation, Commissioning & Maintenance Handbook
Page 72 Issue 10