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NOTE ALSO: When the optional

Model 10VAC Voltage Input Adaptor

is used with

the 10A74-4C, THE EXCITATION LEVEL MUST BE SET TO 10 V-DC (i.e., ±5 V-DC).

3.b S

ETUP OF

ODEL

10A1

FOR

IME

-C

OHERENT

10A74-4C D

ATA

OLLECTION IN

YSTEM

Communicating over the internal Analog Signal Bus, the

Model 10A1 Control Signal

Card

controls and coordinates the TRACK / HOLD function of all Model 10A74-4C

cards mounted in the same “A-card” rack of a “B-sized” System 10 mainframe (only).
When a 10A74-4C’s rear I/O Connector is dedicated to a Bridge Completion Connec-
tor or Model 10VAC Voltage Input Adaptor, that card’s TRACK / HOLD function can
only be controlled by means of a Model 10A1.

In a multi-rack System 10 mainframe, a separate 10A1 is required to control the
10A74-4C cards occupying each rack. All of the mainframe’s 10A1 cards will then be
linked via a special interconnect cable (No. 52369), which is supplied with the cards.

To ensure that all 10A74-4C input channels in the system “capture” their data at the
same instant, a single “master” 10A1 must be designated for synchronization to the
system scan cycle. The System 10 scan cycle can be “slaved” in turn to an external
pulse signal received through the RS-422 interface provided by a designated

Model

10BACI-422 Auxiliary Computer Interface Card

To designate the “master” 10A1, you will need to apply the

TRACK HOLD CONTROL

(THC)

command. This command informs the system’s Central Processor of the par-

ticular 10A1 that is to be “synced” to its scan cycle. Turn ON the system EEPROM
Switch and enter a command of

THC = s [CR]

where “s” is a four-digit number consisting of the DECK No., SLOT No., and SUB-
CHANNEL No. of the selected 10A1 card (here, the SUBCHANNEL number is simply
“1”). Thus, for example, to designate the 10A1 located in Slot 3 of a “B-sized” main-
frame’s Deck No. 1 as the “master” for track-hold control in that mainframe, you would
enter a command of

THC = 1031 [CR]

The system’s “master” 10A1 causes a continuous “HOLD” command to be applied to
all 10A74-4C inputs from all mainframe decks, except during the few microseconds
per scan when it is itself processed as a data channel. During this processing period,
the “HOLD” command is released and all 10A74-4C channels are permitted to track
their respective strain-gage inputs. When the processing of the 10A1-dedicated chan-
nel is complete, the 10A74-4C inputs are again “held” until the next scan. A data set
with minimal time skew is thereby generated with each scan cycle.

3.c C

ONFIGURATION AND

ALIBRATION

For initial configuration of ANALOG INPUT CHANNELS dedicated to a specific Model
10A74-4C card when used in System 10, see the general remarks on System 10 “real-
channel” configuration in Manual Section 1.G.1 and elsewhere in the System 10 Guide-
book. For 10A74-4C channel “type” codes, see Table 2, above.

In System 10, when a Model 10A74-4C is connected to quarter-bridge or half-bridge
gage configurations for purposes of stress analysis, you can perform both

“EMM-

CALCULATED”

and

“SIMULATED (SHUNT)”

calibration of any of its input channels,

regardless of the type of bridge completion being used for that channel. For such a
channel, THE CONVENTIONAL “TWO-POINT (DEADWEIGHT)” TECHNIQUE WILL NOT
WORK AND THE “MVV-CALCULATED” TECHNIQUE USED WITH OTHER STRAIN
GAGE CONDITIONERS IS NOT RECOMMENDED.

DayTronic System 10, User Manual Book

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