Yaskawa MEMOCON GL120 - Manual (Page 198)

System Components: Functions and Specifications
4.4.6 MEMOBUS Modules (RS-422) cont.
— 4-142 —
Example 4
Connecting ASCII Device (1:1 Communications)
PS10: Power Supply Module (7 A)
CPU20: CPU Module (16 KW)
MEM422: MEMOBUS Module (RS-422)
DI: 12/24-VDC 16-point Input Module
DO: 12/24-VDC 16-point Output Module
MB10: 10-slot Mounting Base
Communications by COMM instruction
DI
Set MEMOBUS port of
MEMOBUS Module thus:
D Combined
master/slave port
D transparent mode
Data input
M
PS10 DI MEM
422
M
M P
MB10
Slot No.
Local channel
Rack 1 (CPU Rack)
CPU20
1 2 3 4 5 6 7 8 9 10
DI DO DO
Communications by COMM instruction
M
Bar code reader
Needs to be equipped with
RS-422 interface
Electronic scale
Shielded twisted
pair cable
(500 m max.)
Data input
Needs to be equipped with
RS-422 interface
Figure 4.36 Connecting ASCII Devices (1: 1 Communications)
d) The connector for a MEMOBUS port is a D-sub connector (9-pin, female). The con-
nector pin arrangement and signal names are shown in the following table:
Table 4.60 Pin Arrangement and the Signal Names
Pin No. Symbol Signal Name
1 PGND Protective ground
2 TXD Transmission data
3 RXD Reception data
4 RXDRT Receiver termination resistance:120 Ω
5 − Not used
6 RXD Reception data inversion
7 SGND Signal ground
8 TXRD Sender termination resistance:120 Ω
9 TXD Transmission data inversion
4
A EXAMPLE "