Specifications

Digital I/O Functions 6-4
The Event Counter is read by using the Read Events (RE) command. The
maximum accumulated count is 9,999,999. If the maximum count is
reached, counting stops. The Event Counter may be cleared to zero with
the Clear Events (CE)or Events Read & Clear (EC) command.
The Event Counter is not nonvolatile and the count will be lost if power to
the module goes down. Upon power up, the counter is cleared to zero.
The Remote Reset (RR) command or a line break will not affect the
counter.
ALARM OUTPUTS
The D1000 sensor input modules perform HI/LO limit checking by compar-
ing the sensor input value to downloaded HI/LO limit values stored in
memory (see HI and LO commands). The result of the limit check can be
used to control special HI and LO digital outputs.
The DOØ/LO and DO1/HI output pins can be configured to be alarm
outputs by using the Enable Alarms (EA) command. After performing an
EA command, the state of the DOØ/LO and DO1/HI pins will be controlled
by the alarm settings. The EA command does not affect the other digital
outputs, DO2-DO8. The Disable Alarms (DA) command is used to discon-
nect the alarms from the output pins whereupon they are controlled by the
Digital Output (DO) command.
Since the Alarm Outputs share the same circuits with the Digital Outputs,
all electrical interfacing considerations are the same.
Figure 6.4 Events Counter Circuit