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 (A 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
ON
ON
ON
ON
ON
ON
UNIT ID CODE
ON=4-20mA
OFF=0-20mA
BAUD RATE (BPS)
Serial Control Mode
