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Appendices
Installation & Reference Guide — DOC. 5822
N
OTES
:
1.
Always suffix a
d
(for decimal) to values typed into the
Offset
textbox.
2.
Always enter
1d
into the
Option
textbox for all
Intersystem Communications
symbols.
Multiple channels
Multiple channels apply to connections made through Virtual COM Ports only (
i.e.,
TCP/IP connections only). Each Virtual COM Port can have up to 128 channels,
where each channel can be thought of as a separate COM port. If a separate channel
is used for each
Intersystem Communications
symbol, then all
Intersystem
Communications
symbols can use an offset of zero (
i.e.,
no offset). The advantage
is simplicity; each channel has its own signal space. In this case, the programmer
never needs to worry about offsets on either side.
N
OTE
:
Only systems connected to a Virtual COM Port (via TCP/IP) have multiple channels. The
channel list is disabled (dimmed) in the signal block definition window for systems connected via
RS-232. RS-232 connections are single-channel connections. Do not use multiple channels if there is
any possibility of needing to revert to an RS-232 connection.
Multiple Connections
Usually all
Intersystem Communications
symbols from a single control system
“talk” to the server through one physical connection, although it is possible to install
multiple connections, such as any combination of RS-232 connections (each with its
own cable) and/or or a TCP/IP connections (all referencing the same IP address, but
each with its own IP ID).
N
OTE
:
Multiple connections between a single control system and a single server delivers better
response because of the additional buffers involved. However, keep in mind that multiple TCP/IP
connections do need to be individually licensed.
The COM Settings Signal Block
An
Intersystem Communications
symbol to service the COM Settings signal block
need only be present if at least one signal is defined in the
System Definition
window. However, it need not be at signal offset 0 but could be positioned anywhere
within the signal space subject to the constrains discussed above. If present, the
COM Settings signal block’s
Intersystem Communications
symbol is always
connected to channel #1 in a Virtual COM port.