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CJ1-H and CJ1M CPU Unit Features Section 1-3
Improved Functions for
PRV(881) and PRV2(883)
(CJ1M Only)
High-frequency calculation methods have been added to the pulse frequency
calculation methods for PRV(881) (HIGH-SPEED COUNTER PV READ) and
PRV2(883) (PULSE FREQUENCY CONVERT) instructions (minimizes the
error in high frequencies of 1 kHz or higher). PRV(881) can also be used to
read the pulse output frequency.
Pulse Frequency
Conversions
The pulse frequency input to high-speed counter 0 can be converted to a rota-
tional speed (r/min.) or the PV of the counter can be converted to the total
number of rotations.
Serial PLC Link Function
Data links (9 max.) can be set up between PLCs using the CPU Unit’s RS-
232C port. NT Link (1:N connection) can also be incorporated in a Serial PLC
Link network, allowing the existing NT Link (1:N mode) and the Serial PLC
Link to be used together.
Note 1: PTs are included in the number of links.
Note 2: The Serial PLC Link cannot be used for PT data links.
Scheduled Interrupt Function Used as High-precision Timer
Scheduled interrupts in units of 0.1 ms have been added for CJ1M CPU Units.
An internal PV reset start function for scheduled interrupts has also been
added, so it is possible to standardize the time to the first interrupt without
using the CLI instruction. It is also possible to read the elapsed time from
either a scheduled interrupt start or from the previous interrupt. This allows
the interval timer (STIM instruction) in the CQM1H Series to be easily used for
the CJ Series.
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