23-Point And 28-Point Basic Unit; Wiring - Hitachi HIDIC MICRO-EH Applications Manual

4.4

23-Point and 28-Point Basic Unit

Name and function of each part
13] RS-485 port cover
11] Mounting
hole
4] Serial port cover
No. Item
Explanation of operation
1] POW LED
2] OK LED
3] RUN LED
4] Serial port cover
5] Input terminals
6] Output terminals
7] Power terminal
8] Expansion cover
9] DIP SW cover
10] Terminal cover
11] Mounting hole
12] DIN rail
installation clip
13] RS-485 port cover Cover for RS-485 port. It is connected with a D sub 15-pin female
10] Terminal cover
Detailed explanation
Operations are performed according to the contents of the program created
by the user.
The programming unit connected to the CPU module communication port
writes and reads the user programs.
Memory is installed inside the CPU module in which the user programs and
internal output information are stored.
Lighting when the power is supplied.
Lighting at normal operation.
Lighting at RUN status.
Cover for the connector for connecting
peripheral units and the RUN switch.
When the cover is opened, the RUN switch,
potentiometers (VR), and RS-232C serial port 1
(PORT 1) can be used.
The communication specification is set to port 1.
Terminals for wiring the external input units.
Recommended terminals are shown in the figure
to the right.
One piece of AWG14 to AWG22 (2.1 to 0.36
2
mm ) or two pieces of AWG16 to AWG22 (1.3
2
to 0.36 mm ) per terminal may be wired.
Terminals for connecting the external load.
The wiring specification is the same as for the input terminals.
Terminal for connecting the power supply.
The wiring specification is the same as for the input terminals.
Cover for the expansion connector
Cover for the DIP switches and the backup battery storage unit.
When the cover is opened, the DIP switches are exposed. These DIP
switches are used to set the communication speed of serial port 1 and the
modem connection.
Cover for terminals
Used when installing the PLC with screws
Used when installing the PLC on a DIN rail
connector. The communication specification is set to port 2.
Chapter 4 Product lineup and wiring
Type
5] Input terminals
1] POW LED
2] OK LED
3] RUN LED
8] Expansion
connector cover
9] DIP SW cover
6] Output terminals
12] DIN rail installation clip
7] Power terminal
STOP
RUN
VR1 VR2
PORT1
4-5
EH-*23***
EH-*28***
Remarks
See Chapter 12.
See Chapters 8 and 11.
See Chapter 10.
(Make sure that the terminals will not
6
disengage due to loose screws.)
(Recommended)
6
See Chapter 10.
See Chapter 10.
See Chapter 10.
See Chapter 11.
See Chapter 10.
See Chapter 10.
See Chapter 11.