Delta Electronics Programmable Logic Controller DVP-PLC - Manual (Page 39)

2 Functions of Devices in DVP-PLC
DVP-PLC Application Manual 2-11
2.4 Numbering and Functions of Auxiliary Relays [M]
No. of auxiliary relays (in decimal)
ES/EX/SS series MPU:
General purpose M0 ~ M511, M768 ~ M999, 744 points. Fixed to be non-latched.
Latched M512 ~ M767, 256 points. Fixed to be latched. Auxiliary relay M
Special purpose M1000 ~ M1279, 280 points. Some are latched.
Total 1,280
points
SA/SX/SC series MPU:
General purpose M0 ~ M511, 512 points. Fixed to be non-latched.
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.
Total 4,096
points
EH/EH2/SV series MPU:
General purpose
M0 ~ M499, 500 points. Can be modified to be latched by setting up
parameters.
Latched
M500 ~ M999, M2000 ~ M4095, 2,596 points. Can be modified to be
non-latched by setting up parameters. Auxiliary relay M
Special purpose M1000 ~ M1999, 1,000 points. Some are latched.
Total 4,096
points
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 encouters 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 puspose 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:
Initial latched S0 ~ S9, 10 points. Fixed to be latched.
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.
Total 128
points
SA/SX/SC series MPU:
Initial S0 ~ S9, 10 points. Fixed to be non-latched.
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.
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.
Total
1,024 points