DayTronic System 10 - 1.F Scan and Time Setup; 1.F.1 Setting System Base Channel: SBC; 1.F.2 Definition of Scan Range

1.F.1 SETTING SYSTEM BASE CHANNEL: SBC
The SYSTEM BASE CHANNEL (SBC) command is useful only when you need a
way to distinguish the data-channel ranges of multiple System 10 mainframes
operating in the same environment. IN MOST SYSTEM 10 APPLICATIONS, YOU
WILL HAVE NO REASON TO CHANGE THE BASE CHANNEL FROM ITS NORMAL
DEFAULT VALUE OF “1.”
If you want to change the current base channel, enter a command of
SBC = x [CR]*
where “x” is any CHANNEL NUMBER from “1” through the number that would
result in a
highest channel at the system limit of “997.”
WARNING: This is a fairly drastic step, and should only be done at the beginning
of the configuration process
, before any actual channels have been defined.
Changing the base channel will automatically shift all channel numbers accord-
ingly, as well as the current
TERMINATOR (TER) and SCAN (SCN) settings (see
next section). You should also review all CALCULATES, EXECUTES, DIGITAL I/O,
and other configuration statements that may contain channel-number references.
Any such statements will need to be individually revised to correspond to the new
channel-number sequence
.
1.F.2 DEFINITION OF SCAN RANGE
NOTE: DEFINITION OF SYSTEM SCAN RANGE SHOULD PRECEDE THE CALI-
BRATION OF SYSTEM DATA CHANNELS (SECTION 1.G).
There are two mnemonic commands by which you can specify the precise range
of data channels to be scanned by the System 10 Central Processor.* The
TER-
MINATOR (TER)
command is a “WRITE” command, and thus requires the EEP-
ROM Write Protect Switch to be ON. The
SCAN (SCN) command, on the other
hand, is ordinarily a “RUN-TIME” command, and does not require the EEPROM to
be enabled.
The data reported by any system channel outside the currently effective scan
range will not be updated with each scan cycle. You should especially bear this in
mind when outputting data for a range of channels via the
DUMP (DMP),
STREAM (STR), HARD COPY (HCY), SNAPSHOT (SNP), or LIMIT ZONE (LZN)
commands (see Section 1.H.2)—or when applying the ZERO (ZRO), FORCE
(FRC)
, and TARE (TAR) commands to one or more data channels (see Sections
1.G.5 and 2.G.3).
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SCAN AND TIME SETUP 1.F
1.F.1 SETTING SYSTEM BASE CHANNEL (SBC) 1.F.2 DEFINITION OF SCAN RANGE
SYSTEM 10 GUIDEBOOK
1.F SCAN AND TIME SETUP
*Every mainframe’s initial default scan range is normally preset at the factory, the typical range
being from Channel No. 1 through the highest channel number called for by the system config-
uration specified at the time of order.