1 internal relay
PLC internal relay and input and output relays, they can not be driven by external signals, can not directly drive the external device, but can be controlled by the controller to drive a variety of contacts. Internal relays included
1. Internal auxiliary relay (AR)
2. Keep the relay (HR)
3. temporary relay (TR)
4. Data Storage Relay (DM)
2 dedicated internal auxiliary
C series P-type machine has 16 dedicated internal auxiliary relays (1808 ~ 1907), they are the internal auxiliary relay 18 channel left byte and 19 channel right byte, respectively, used to indicate the programmable controller operating status, As well as the generation of pulses and some special treatment for PLC.
3 timers, counters
The C-Series P-type machines offer 48 timers or 48 counters, or a combination of a total of 48 timers and counters.
Timers and counters are numbered TIMOO ~ TIM47 or CNTOO ~ CNT47. When assigning timers and counter numbers, the numbers can not be the same, for example, neither TIM03 timer nor CNT03 counter.
When the power is turned off, the timer is reset, and the counter is not reset, with power-down protection.

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