Inovance H3U Series - Output Relay y; Auxiliary Relay

35
3
3 Elements
3.3 Auxiliary Relay
• The ports of extension modules are always numbered from an octal number starting with 0.
3.2.2 Output Relay Y
The output relay is an element that is directly associated with the hardware ports of external user control
devices, and logically corresponds to the PLC's physical output port in one-to-one manner. Each time after
the PLC nishes scanning a user project, it transfers the element status of the relay Y to its hardware ports,
with 0 indicating an open-circuit output port (OFF), and 1 indicating a closed output port (ON).
The relays Y are marked with Y0, Y1, …Y7, Y10, and Y11, and numbered with an octal number. The
relays Y can be used innitely in the user project. The hardware can be divided into relays and transistors.
If output extension module ports exist, all the ports are numbered in sequence starting from the ports of
the main module. When a local extension module is connected, the Y ports on the extension module are
numbered immediately after the X ports on the main module. For example, if the main module is the H3U
standard model, when an AM600-0016ETN extension module is connected, because the last Y port of the
main module is Y37, the Y ports of the extension module are numbered Y40 to Y47, and Y50 to Y57 during
programming.
Note: The ports of extension modules are always numbered from an octal number starting with 0.
3.3 Auxiliary Relay
Used as an intermediate variable during execution of the user project, the auxiliary relay M element functions like
the auxiliary relay in an actual electronic control system. It transfers the status information and combines multiple
M variables into a word variable. The M variables have no direct relation to external ports, but can copy X to M
through a project statement or copy M to Y to establish contact with external ports. One M variable can be used
innitely.
The auxiliary relays are marked with M0, M1, …… and M8511, and numbered with a decimal number. M8000 and
subsequent variables are dedicated to the system for interaction of the PLC user project and system status. Part
of the M variables can be retained upon power failure.
The special auxiliary relays SM are variables dedicated to the system for interaction of the PLC user project and
system status. They are marked with SM0, SM1, …… and SM1023, and numbered with a decimal number.
For general
purpose
For retention
purpose
For retention
purpose
For special purpose For special purpose
M0 to M499
500 points
[1]
M500 to M1023
524 points
[2]
M1024 to M7679
6656 points
[3]
M8000 to M8511
512 points
SM0 to SM1023
1024 points
• [1] It cannot be retained upon power failure. It can be set to be retained upon power failure through parameter
setting.
• [2] It can be retained upon power failure. It can be set to be not retained upon power failure through parameter
setting.
• [3] It can be retained upon power failure and the status cannot be modied through parameter setting.