IOtech MultiScan 1200, Руководство пользователя

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26 Chapter 2: TempScan/1100 & MultiScan/1200 TempScan / MultiScan User's Manual
Scanning Card & Channel Expansion
Scanning Card Expansion
Each TempScan/1100 or MultiScan/1200 unit can accept one scanning card to provide signal
conditioning. However, if your application demands more channels then you can expand the master
unit’s capabilities with either or both types of expansion units: Exp/10A and/or Exp/11A. Each
Exp/10A expansion unit allows for the addition of two scanning cards, while each Exp/11A expansion
unit allows for the addition of ten scanning cards. Up to fifteen Exp/10A units can be attached to the
master unit, giving a maximum of 30 additional scanning-card slots. Similarly, up to three Exp/11A
units can be linked to the master unit, also giving a maximum of 30 additional scanning-card slots, as
shown in the following table.
Expansion Capabilities Exp/10A Exp/11A
Number of expansion scanning-card slots per expansion unit 2 10
Number of identical expansion units that can be linked to the master unit 15 3
Maximum number of expansion scanning-card slots 30 30
Note:
If a combination of Exp/10A and Exp/11A expansion units are linked together, then the
maximum number of expansion scanning-card slots is still 30.
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.