2 -4
Relay No.
Function
Description
3. Pulse Signals
◤
M1920
0.01S Clock pulse
T(M1920)=0.01S
◤
M1921
0.1S Clock pulse
T(M1921)=0.1S
◤
M1922
1S Clock pulse
T(M1922)=1S
◤
M1923
60S Clock pulse
c
"1"
"0"
T
T is the pulse period
T(M1923)=60S
◤
M1924
Initial pulse (first scan)
d
◤
M1925
Scan clock pulses
e
◤
M1926
Reserved
M1925
M1924
"STOP"
"RUN"
t
t
t
t
t
t is the scan time
◤
M1927
CTS input status of communication
port 1
y
0
:
CTS True (ON)
y
1
:
CTS False (OFF)
y
When communication port 1 is used to connect with the printer
or modem, it can use this signal and a timer to detect whether
the printer or the modem is ready.
4. Error Messages
◤
M1928
Reserved
◤
M1929
Reserved
◤
M1930
No expansion unit or exceed the limit
on number of I/O points
y
1: Indicating no expansion unit or exceed the limit on number of
I/O points
◤
M1931
Immediate I/O not in the main unit
range
y
1: Indicating that Immediate I/O not in the main unit range and
the main unit cannot RUN
◤
M1932
Unused
◤
M1933
System stack error
y
1: Indicating that system stack error
◤
M1934
│
Reserved
◤
M1935
5.Port3
~
Port4 Controls
(
MC/MN
)
M1936
Port 3 busy indicator
y
0
:
Port 3 Busy
y
1
:
Port 3 Ready
M1937
Port 3 finished indicator
y
1
:
Port 3 finished all communication transactions
M1938
Port 4 busy indicator
y
0
:
Port 4 Busy
y
1
:
Port 4 Ready
M1939
Port 4 finished indicator
y
1
:
Port 4 finished all communication transactions
c
d
e