MAN0188-04

MAN0188-04
Data Access Unit
For the Micro PLC
Product Specifications
And Installation Data
1
DESCRIPTION
The Data Access Unit (HE620TCR020) provides important functionality to users of the Micro PLC. This
NEMA 4-12, panel mountable unit allows Micro PLC users to access the complete PLC I/O table, where
changes can be made to machine setpoints, etc. The Data Access Unit features a two-line by 16
character LCD display. The LCD characters are bright and highly visible with a character height of .38".
Eight tactile feel keys allow the user to select, display, force and/or change registers in the Micro PLC.
The unit communicates to the Micro PLC serial programming port through an RS-232 port. The Data
Access Unit is powered by 12 or 24VDC, which is provided to the unit through a two position removable
terminal strip. The Data Access Unit is not programmable, its functionality is pre-defined at the factory.
Figure 1 - Front Panel (Actual Size)
19 May 2000
MAN0188-04
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19 MAY 2000
SPECIFICATIONS
Table 1 – HE620TCR020 Specifications
NEMA Rating
Baud Rate (fixed)
4-12
Height
Parity, Data Bits, Stop Bits
3.50”
Width
DC Operating Voltage
6.00”
Depth
Current @ 24VDC
2.13”
Display Lines x Characters
Operating Temperature
2 x 16
Character Height
Relative Humidity, non-condensing
.375”
3
MAN0188-04
9600
N, 8, 1
8-32V
100mA
0-60°C
5-95%
COMMUNICATIONS CABLE
Figure 2 – Serial Communications
The wiring diagram for the communications cable between the Data Access Unit's RS-232 port and the Micro PLC is
shown above. This cable should not be longer than six feet.
MAN0188-04
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PAGE 3
PANEL CUTOUT
Figure 3 – Panel Cutout
5
OPERATION
5.1
Selecting the Register to View
The I/O key is used to select the Register type to be monitored.
After the proper type is displayed, pressing ↑ and/or ↓ selects the register or I/O point
to be displayed.
Pressing one of the arrow keys and the Fast key at the same time causes the register or I/O point
number to increment or decrement more quickly.
5.2
Modifying a Register or I/O Value
When the desired I/O point is displayed on the top line, pressing the Modify key will cause its value to
flash.
Pressing the ↑ or ↓ key causes the I/O value to increment or decrement.
Pressing one of the arrow keys and the Fast key at the same time causes the data value to increment or
decrement more quickly.
Pressing the Zero key sets the selected I/O register's value to 0.
Pressing Enter causes the new data value to be written to the I/O register.
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5.3
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MAN0188-04
Returning to the First Reference Address
Pressing the Zero key selects the first reference of the displayed register type.
5.4
Forcing a Digital Input or Output Point
Display the FI (force input) or FO (force output) bit for the I/O point to be forced. Set it to "1" by pressing
the Modify key, then ↑ and then Enter. With the FI or FO bit set, the I/O point is no longer controlled by
the PLC, but may be directly controlled from the keypad, by setting the I or O bit to 1 (ON) or 0 (OFF). To
return control of the I/O point to the PLC, set the FI or FO bit back to 0.
Note: The TCR key performs no function with this model.
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