4
Figure 2.
SW5 MSB Self Test Mode
* according to para #5.2
6. PARALLEL CONTROL MODE* according to para #5.2
In the parallel control mode, the DRA-DCC-8 unit is controlled via a 15 bit bus.
Three Address bits (A0-A3) select the proper current output channel and 12 Data
bits (D0-D11) determine its value (A0 and D0 are MSB). The DRA-DCC-8
microprocessor continuously scans the input vector (Address + Data) terminals
and updates its memory tables upon recognizing a new vector. The unit is
asynchronous in nature. The data should be valid for at least 160 microseconds.
S1 S2 S3 S4 S5 S6 S7
SELF TEST#1 ON OFF X OFF
X
OFF ON OFF
X
MODE
ON ON OFF
X
SELF TEST#2
SELF TEST#3
*
*
S1 S2 S3 S4 S5 S6 S7
PARALLEL MODE OFF OFF * OFF
X
MODE
6.1 PLC INTERFACE
The PLC's output modules can be divided into
three popular types; TTL output module, 24Vdc
sink type and 24Vdc source type.
There is a jumper selector on printed circuit card
PN 7040 which selects between Sink/Source
input. (TTL output module should usualy be
considered as sink type). See figure 2.
SINK SOURCE
S1 S2 S3 S4 S5 S6 S7
300
4800
9600
19200
OFF OFF
OFF
OFF
ON
ON
ONON
ON
ON
ON
ON
UNIT ID CODE
ON=4-20mA
OFF=0-20mA
BAUD RATE (BPS)