Specifications

D1600 Data Sheet B-5
Event Counter
The Event Counter input is connected to the Digital Input 0 terminal. It can
be used to count any low speed event that occurs on the DIØ/EV input.
Any of the interfacing techniques described for Digital Inputs may be used.
The input pulses must meet the specifications in Figure 6.4 to avoid
missing counts. Switch inputs are filtered to eliminate contact bounce.
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 Events
Read & Clear (EC) command reads the number of events since the
counter was last cleared and automatically clears the count to zero..The
EC command eliminates a problem that may occur with a Read Events
(RE) and Clear Events (CE) command sequence. Any counts that may
occur between the RE-CE sequence will be lost. The EC command
guarantees that the counter is read and cleared without missing any
counts.
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.
Figure B-6 Events Counter Cicuit.