2 Functions of Devices in DVP-PLC 2.4 Numbering and Functions of Auxiliary Relays [M] No. of auxiliary relays (in decimal) ES/EX/SS series MPU: SA/SX/SC series MPU: EH2/SV/EH3/SV2 series MPU: Functions of auxiliary relays: Both auxiliary relay M and output relay Y have output coils and contact A, B, and there is no limitation on the times of using the contact. You can use auxiliary relay M to assemble a control loop, but it cannot directly drive the external load. There are three types of auxiliary relays: 1. General purpose auxiliary relay: If the relay encounters power cut during the operation of the PLC, its status will be reset to Off and stay Off when the power is on again. 2.
Latched auxiliary relay: If the relay encounters power cut during the operation of the PLC, its status will be retained and stay at the status before the power cut when the power is on again. 3. Special purpose auxiliary relay: Every relay of this kind has its specific function. Do not use undefined special purpose auxiliary relay. See 2.10 for special purpose auxiliary relay of all series MPU and 2.11 for its functions. 2.5 Numbering and Functions of Step Relays [S] No. of step relays (in decimal) ES/EX/SS series MPU: SA/SX/SC series MPU: DVP-PLC Application Manual 2-14 General purpose M0 ~ M511, M768 ~ M999, 744 points. Fixed to be non-latched.
Total 1,280 points Auxiliary relay M Latched M512 ~ M767, 256 points. Fixed to be latched. Special purpose M1000 ~ M1279, 280 points. Some are latched. General purpose M0 ~ M511, 512 points. Fixed to be non-latched. Total 4,096 points Latched M512 ~ M999, M2000 ~ M4095, 2,584 points. Can be modified to be non-latched by setting up parameters. Auxiliary relay M Special purpose M1000 ~ M1999, 1000 points. Some are latched. General purpose M0 ~ M499, 500 points. Can be modified to be latched by setting up parameters. Total 4,096 points Auxiliary relay M Latched M500 ~ M999, M2000 ~ M4095, 2,596 points. Can be modified to be non-latched by setting up parameters.
Special purpose M1000 ~ M1999, 1,000 points. Some are latched. Initial latched S0 ~ S9, 10 points. Fixed to be latched. Total 128 points Zero return latched S10 ~ S19, 10 points, used with IST instruction. Fixed to be latched. Step relay S Latched S20 ~ S127, 108 points. Fixed to be latched. Initial S0 ~ S9, 10 points. Fixed to be non-latched. Total 1,024 points Step relay S Zero return S10 ~ S19, 10 points, used with IST instruction. Fixed to be non-latched. General purpose S20 ~ S511, 492 points. Fixed to be non-latched. Total 1,024 points Latched S512 ~ S895, 384 points. Can be modified to be non-latched by setting up parameters. Step relay S Alarm S896 ~ S1023, 128 points.
Fixed to be latched.