Hitachi EH Series

The following applies to Hitachi EH Series Point- to-Point and Multi Drop Communications..

Details on the device address can be found in the Device Properties Information Topic.

External Address Format

External address is an ascii string which exactly references an item of data within the PLC. It can be entered at configure time as a text string, and will be validated by the system before use. For this protocol the external address has the following format:

N - dec number 0 - 9

H - Hex number 0 - F

Type	Offset
X	HHHNN
Y	HHHNN
R	HHH
M	HHHH
L	HHHH
WX	HHHN
WY	HHHN
WR	HHHH
WRS	HHHH
WM	HHH
WL	HHH
TMR/CTR	NNN
CL	NNN
TC	NNN
DIF	NNN
DFN	NNN

Offset Format

The software also allows an item of data within the PLC to be referenced by means of a table selection and an offset. The following table shows the offset and table formats for both Point- to- Point and Multi Drop Communications

Table	External Address Type	Type	Offset Format	Offset Range	Privilege R = Read W = Write	Description
X	X	Bit	HHHNN	00000-4FF95	RW	External Bit Input
Y	Y	Bit	HHHNN	00000-4FF95	RW	External Bit Output
R	R	Bit	HHH	000-7FF	RW	Internal Bit Output
M	M	Bit	HHHH	0000-3FFF	RW	Bit Area Data
L	L	Bit	HHHH	0000-3FFF	RW	Bit CPU Link Area
WX	WX	Word	HHHN	0000-4FF9	RW	External Word Input
WY	WY	Word	HHHN	0000-4FF9	RW	External Word Output
WR	WR	Word	HHHH	0000-43FF	RW	Internal Word Output
WRS	WRS	Word	HHHH	F000-F1FF	RW	Internal Word Output
WM	WM	Word	HHH	000-3FF	RW	Word Data Area
WL	WL	Word	HHH	000-3FF	RW	Word CPU Link Area
TMR/CTR	TMR/CTR	Bit	NNN	000-511	RW	Timers and Counters
CL	CL	Bit	NNN	000-511	RW	Elapsed Count Clear
TC	TC	Word	NNN	000-511	RW	Timer Counter Elapsed Time
DIF	DIF	Bit	NNN	000-511	RW	Rising Edge Detection
DFN	DFN	Bit	NNN	000-511	RW	Falling Edge Detection

Property Pages

No property pages exist for this protocol

Protocol Compatibility

A bit type table such as �X� will support the configuration of point types bigger than a bit. If a 16-bit point is configured for example, 16 bits will be read from the table to fill the point. The Hitachi protocol fully supports writing back multiple bit points.

A word type table such as �WX� supports the configuration of smaller or bigger point types. All larger point types will read the required number of words to fill the point. Byte type points will scale down the word to fit it into a byte. Bit type points allow the selection of a bit offset to reference the required bit from the word (0-15). In the case of bit selection points, drive outs will perform a read/modify/write operation as the protocol does not support a bit set operation in this case.

Note: The �W� tables address the same data as the relevant bit tables but as words (except for R and WR which are separate).

Port Settings

RS232

	Baud Rate	19200
	Data Bits	7
	Stop Bits	1.0
	Parity	Even

Wiring Information

Connection of the PLC to a panel will be via either COM1 or COM2, using RS232 communications. The panel pin out diagram is shown below:

Generate/hitachi_eh_series.gif

Connection of the PLC to a PC running OPC Server will be via any available COM port, which may be either 25 pin or 9 pin depending on what is available. OPC Server will require RTS flow control to be enabled on the PC. The COM port pin out is shown below:

Generate/hitachi_eh_series1.gif

The Hitachi EH PLC is connected to using a 9 pin d-type to RJ45 cable. The RJ45 connector plugs directly into the PLC. The following shows how this cable is wired:

Example

Internal Word Output Table - first word

WRSF000

Bit Area Data - last bit

M3FFF