Siemens QUADLOG - Field Wire Selection; Marshalled Termination Assembly - I;O Wiring Connections

Installation SDQLCAI-1
2-16 May 2002
The CAI supports the following channel types:
 CAI Analog Input Channel (CAIC)
 Critical Discrete Supervised Input (CDSI)
 Critical Analog Input, Programmable Limits (CAIP)
Wiring examples are provided in this section.
WARNING
Non-isolated inputs. Analog input channels share a common ground.
All I/O connected to this equipment must operate at extra low voltage or
all equipment must be inaccessible to the user.
2.7.1 Field Wire Selection
A jacketed, shielded, stranded twin- or triple-conductor cable is recommended. Refer to Table 2-1 for
wire selection.
Table 2–1 Field Wire Selection
TERMINATION STYLE WIRE SIZE
Standard CAI/SAI Marshalled
Termination Assembly channel terminals
24 to 12 AWG (0,23 to 3,3 mm
2
) stranded or solid single
conductor per terminal. Maximum wire size of two
conductors per terminal = 14 AWG (2,1 mm
2
).
Standard CAI/SAI Marshalled
Termination Assembly power terminals
24 to 10 AWG (0,23 to 5,3 mm
2
) stranded or solid single
conductor per terminal. Maximum wire size of two
conductors per terminal = 12 AWG (3,3 mm
2
).
AWG = American Wire Gauge mm
2
= square millimeters
2.7.2 Marshalled Termination Assembly – I/O Wiring Connections
The CAI/SAI Marshalled Termination Assembly, as shown in Figure 2–8, provides terminals for
connecting of up to 32 channels of I/O wiring. Each assembly is arranged as follows:
 The Marshalled Termination Assembly has four screw terminals per channel and each set is labeled
consecutively from channel 1 to 32.
 All input channels are non-isolated, as all (-) terminals are electrically common.
 All shield terminals are electrically common.