Delta Industrial Automation HMI Hitachi EH Series PLC Connection Manual
Summary
Essential technical manual providing comprehensive guidelines for integrating Hitachi EH series Human-Machine Interfaces (HMIs) and Programmable Logic Controllers (PLCs). This guide offers detailed wiring diagrams and instructions for various industrial communication standards, including RS-232, RS-422, and RS-485 protocols. It also thoroughly defines all system memory addressing—covering registers, data bits, timers, and counters. This resource is critical for automation engineers and technicians designing complex control systems needing reliable setup and seamless integration with specialized industrial components.
Page 1 Text Content
Hitachi EH series PLC （支持 Procedure1、Procedure 2 通讯模式）
通讯速率：19200, 7, Even, 1 (RS232) 控制器站号：0 控制区/状态区：WR0 / WR10
a. RS-232（DOP-A/AE/AS, DOP-B 系列适用） DOP 接线端 Controller 接线端 9 pin D-sub male (RS-232) RJ-45 接头 (RS-232)
RXD (2) (5) SD1
TXD (3) (6) RD1
GND (5) (1) SG1
RTS (7) (7) DR1
CTS (8) (8) RS1
b. RS-422（DOP-A/AE 系列适用） DOP 接线端 Controller 接线端 9 pin D-sub male (RS-422) RJ-45 接头 (RS-422)
RXD- (1) (5) TXN
RXD+ (2) (4) TX
TXD+ (3) (6) RX
TXD- (4) (7) RXN
GND (5) (1) SG1
V1.02 Revision November, 2011 57
Page Summary Contents For Delta Industrial Automation HMI Hitachi EH Series PLC Connection Manual
Manual Details
| Brand | Hitachi |
|---|---|
| Pages | 6 |
| File Size | 133.52 KB |
| Published | June 05, 2026 |
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Frequently Asked Questions
What is the default communication rate?
The default communications rate is 19200 baud, with parity set to Even.
How are external I/O addresses formatted?
External Input (X) uses format Xrubs; External Output (Y) uses Yrubs. The format specifies Rank No., Unit No., Slot No., and Bit No.
What is required for the HMI to access External I/O data?
The EH PLC's External I/O (WX, WY, X, Y) information must be set up first; otherwise, the HMI cannot access that location.
Which communication standard uses specific connections for DOP-A/AE series and RJ-45 terminals?
Both RS-232 and RS-485 use dedicated connection diagrams specifying terminal assignments (like RXD, TXD, D+, D-, etc.).