Measurement Computing TempScan/1100 - Manual (Page 31)

TempScan / MultiScan User’s Manual 899493 System Overview 1-17
Channel Expansion
The TempScan/1100 system can be expanded up to 992 channels, while the MultiScan/1200 system can be
expanded up to 744 channels. This is easily accomplished via a master/slave architecture wherein a main
or master unit can be connected to as many expansion slave units as allowable within the maximum of
30 scanning cards.
Each Exp/10A or Exp/11A expansion unit has a form factor identical to that of either the TempScan/1100
or MultiScan/1200 master unit, allowing the expansion unit to accept the same scanning cards as its master
unit. When connected to the TempScan/1100, the Exp/10A or Exp/11A is configurable for 32 or 64 input
channels, providing a total expansion capacity of up to 992 channels. When connected to the
MultiScan/1200, the Exp/10A or Exp/11A is configurable for 24 or 48 input channels, providing a total
expansion capacity of up to 744 channels.
An expansion unit can only be controlled by the TempScan/1100 or MultiScan/1200 master unit, and no
digital I/O or alarms are included. However, expansion channels can be programmed to stimulate the
alarms located on the master unit. From the programmer’s perspective, channels are accessed in the same
way as channels in the master unit. When the master unit detects the presence of expansion units during its
power-on sequence, it makes the additional channels available to the programmer. The
U8 command is
available to query the master unit for the total number of channels in the system.
A general description of both types of expansion units, their connections and their configurations,
is discussed in the following chapters.
Power Line & Fuse Configuration
Introduction
The power configuration of any master or expansion unit consists of selecting the line voltage and
replacing the fuses. All of these units – TempScan/1100, MultiScan/1200, Exp/10A, and Exp/11A – each
has a factory default to operate at 105-125 volts AC. However, each unit may be operated at either 105-
125 or 210-250 VAC.
WARNING
Do not use this unit outdoors! The unit is intended for indoor use only! Outdoor
conditions could result in equipment failure, bodily injury or death!
WARNING
Never disassemble the case while it is connected to the AC power line! Internal
voltage potentials exist which could cause bodily injury or death!
WARNING
Never disconnect the AC power line from the unit while its scanning cards are
connected to an external device! Common mode voltage potentials exceeding 60
VDC or 30 Vrms at the terminals, may exist which could cause bodily injury or
death!