Series HMI Connection Manual
Emerson EC20 Series PLC
HMI Factory Setting:
Baud rate: 19200, 8, Even, 1
Controller Station Number: 1
Control Area / Status Area: D0/D10
Connection
a. RS-232 (DOP-A/AE/AS, DOP-B Series)
DOP series Controller
9 pin D-sub male (RS-232)
RXD (2) (3)TXD
TXD (3) (2) RXD
b. RS-485 (DOP-A/AE Series)
DOP series Controller
9 pin D-sub male (RS-485)
D+ (2)
D+ (3)
D- (1)
D- (4)
(7) TX_A
(8) RX_B
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(5)
c. RS-485 (DOP-AS57 Series)
DOP series Controller
Series HMI Connection Manual
Terminal Block(RS-485)
R+ (7) TX_A
R- (8) RX_B
GND
d. RS-485 (DOP-AS35/AS38 Series)
DOP series Controller
Terminal Block (RS-485)
R+
T+
R-
T-
(RS-485)
(RS-485)
(7) TX_A
(8) RX_B
GND
e. RS-485 (DOP-B series)
DOP series Controller
9 pin D-sub male (RS-485) (RS-485)
D+ (1) TX_A (7)
D- (6) RX_B (8)
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Series HMI Connection Manual
Definition of PLC Read/Write Address
a. Registers
Type
Data Word D Dn D0 – D7999 Word
Special Data Word SD SDn SD0 – SD255 Word 3
Data Word Z Zn Z0 – Z15 Word
Timer T Tn T0 – T255 Word
Counter C Cn C0 – C199 Word
Double word Counter CDW CDWn CDW200 – CDW255 Double
Double word Data Word DDW DDWn DDW0 – DDW7998 Double
b. Contacts
Type
External Output Relay Y Yb Y0 – Y377 Octal
Format
Read/Write Range
Word No. (n)
Format
Read/Write Range Note
Bit No. (b)
Data
Note
Length
Word
Word
External Input Relay X Xb X0 – X377 Octal
Internal Relay M Mb M0 – M1999
Special Internal Relay SM SMb SM0 – SM255 3
Status Relay S Sb S0 – S991
Timer T Tb T0 – T255
Counter C Cb C0 – C255
NOTE
1) Emerson EC20 series PLC has two communication ports, COM0 and COM1. They are
provided for the communication protocol for connecting to PC, Modbus communication
protocol and user-defined protocol. The default setting is COM0 to be enabled only, so the
user needs to set the communication mode as Modbus RTU via PC software before using it.
2) COM1 supports RS-232 and RS-485.
3) Please note that not all of the addresses can be written when reading SM and SD device. We
recommend the user not to set all of the addresses as write address except when setting
parameters.
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