User Manual

1.4 Block Diagram
80188-20
16 bits timer
SRAM=128K
Flash-ROM=256K
7521
COM2,RS-485
3000V isolation
COM1
RS-232/RS-485
EEPROM
(2K)
5-digit LED
(options)
+10V to +30V
p
ower converte
r
+5V
D/O=3 channel
150mA
,
30V
D/I=3 channel
3.5V ~30V
80188-20
16 bits timer
SRAM=128K
Flash-ROM=256K
7522
COM2,RS-485
3000V isolation
COM1
RS-232/RS-485
EEPROM
(2K)
5-digit LED
(options)
+10V to +30V
p
ower converte
r
+5V
D/O=1 channel
150 mA
,
30V
D/I=3 channel
3.5V ~30V
COM3,RS-232
Watchdog
circuit
Watchdog
circuit
7521/2/2A/3/4/7 Series Hardware User’s Manual, Ver. 1.5 Sep/2002, 7Mh-001-15 -----28