Appendix. Special Relays. In This Appendix... DL06 PLC Special Relays...D 2

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1 Special Relays ppendix In This ppendix... L0 PL Special Relays...

2 ppendix : Special Relays L0 PL Special Relays Special Relays are just contacts that are set by the PU operating system to indicate a particular system event has occurred. These contacts are available for use in your ladder program. Knowing just the right special relay contact to use for a particular situation can save a lot of programming time. Since the PU operating system sets and clears special relay contacts, the ladder program only has to use them as inputs in ladder logic. Startup and Real-Time Relays SP0 First scan PU Status Relays On for the first scan after a power cycle or program to run transition only. The relay is reset to off on the second scan. It is useful where a function needs to be performed only on program startup. SP lways ON Provides a contact to ensure an instruction is executed every scan. SP lways OFF Provides a contact that is always off. SP minute clock On for 0 seconds and off for 0 seconds. SP4 second clock On for 0. second and off for 0. second. SP 0 ms clock On for 0 ms. and off for 0 ms. SP 0 ms clock On for ms. and off for ms. SP lternate scan On every other scan. SP Forced run mode On when the mode switch is in the run position and the PU is running. SP Terminal run mode On when the mode switch is in the TERM position and the PU is in the run mode. SP Test run mode On when the PU is in the test run mode. SP Test stop mode On when the PU is in the test stop mode. SP Terminal PGM mode On when the mode switch is in the TERM position and the PU is in program mode. SP Forced stop On when the mode switch is in the STOP position. SP0 Forced stop mode On when the STOP instruction is executed. SP Interrupt enabled On when interrupts have been enabled using the ENI instruction. - L0 Micro PL User Manual, rd Edition, Rev.

3 System Monitoring ppendix : Special Relays SP Override setup relay On when the override function is used. SP Scan controller On when the actual scan time runs over the prescribed scan time. SP40 ritical error On when a critical error such as I/O communication loss has occurred. SP4 Warning On when a non critical error has occurred. SP4 iagnostics error On when a diagnostics error or a system error occurs. SP4 Low battery error On when the PU battery voltage is low (only if bit of V is set). SP44 Program memory error On when a memory error such as a memory parity error has occurred. SP4 I/O error On when an I/O error such as a blown fuse occurs. SP4 ommunications error On when a communication error occurs on any of the PU ports. SP0 Fault instruction On when a Fault Instruction is executed. SP Watch og timeout On if the PU Watch og timer times out. SP Grammatical error SP Solve logic error On if PU cannot solve the logic. ccumulator Status On if a grammatical error has occurred either while the PU is running or if the syntax check is run. V will hold the exact error code. SP4 ommunication error On when RX, WX, instructions are executed with the wrong parameters. SP Table instruction overrun On if a table instruction with a pointer is executed and the pointer value is outside the table boundary. SP0 Value less than On when the accumulator value is less than the instruction value. SP Value equal to On when the accumulator value is equal to the instruction value. SP Greater than On when the accumulator value is greater than the instruction value. SP Zero On when the result of the instruction is zero (in the accumulator). SP4 Half borrow On when the bit subtraction instruction results in a borrow. SP orrow On when the bit subtraction instruction results in a borrow. SP Half carry On when the bit addition instruction results in a carry. SP arry On when the bit addition instruction results in a carry. SP0 Sign On anytime the value in the accumulator is negative. SP Pointer reference error On when the V-memory specified by a pointer (P) is not valid. SP Floating point number On anytime the value in the accumulator is a valid floating point number. SP Overflow On if overflow occurs in the accumulator when a signed addition or subtraction results in an incorrect sign bit. SP4 Underflow On anytime a floating point math operation results in an underflow error. SP ata error On if a number is expected and a non number is encountered. SP Load zero On when any instruction loads a value of zero into the accumulator. L0 Micro PL User Manual, rd Edition, Rev. -

4 ppendix : Special Relays HSIO Input Status SP0 X0 status On when X0 is on SP X status On when X is on SP X status On when X is on SP X status On when X is on HSIO Pulse Output Relay SP4 Profile omplete On when the pulse output profile is completed. (Mode 0) ommunication Monitoring Relay SP PU port busy Port On when port is the master and sending data. SP ommunications error Port Option Slot ommunication Monitoring Relay SP0 Slot busy H0-EOM/0-M Port SP Slot error H0-EOM/0-M Port SP Slot busy H0-EOM/0-M Port SP Slot error H0-EOM/0-M Port SP4 Slot busy H0-EOM/0-M Port SP Slot error H0-EOM/0-M Port SP Slot 4 busy H0-EOM/0-M Port SP Slot 4 error H0-EOM/0-M Port Option Slot Special Relay SP0- Slot SP relay for option card SP40- Slot SP relay for option card SP40-4 Slot SP relay for option card SP40- Slot 4 SP relay for option card On when port is the master and has a communication error. -4 L0 Micro PL User Manual, rd Edition, Rev.

5 ppendix : Special Relays ounter Mode Equal Relays SP40 urrent = target value On when the counter current value equals the value in V/0 SP4 urrent = target value On when the counter current value equals the value in V/ SP4 urrent = target value On when the counter current value equals the value in V/4 SP4 urrent = target value On when the counter current value equals the value in V/ SP44 urrent = target value On when the counter current value equals the value in V4/40 SP4 urrent = target value On when the counter current value equals the value in V4/4 SP4 urrent = target value On when the counter current value equals the value in V4/44 SP4 urrent = target value On when the counter current value equals the value in V4/4 SP0 urrent = target value On when the counter current value equals the value in V/0 SP urrent = target value On when the counter current value equals the value in V/ SP urrent = target value On when the counter current value equals the value in V/4 SP urrent = target value On when the counter current value equals the value in V/ SP4 urrent = target value On when the counter current value equals the value in V/0 SP urrent = target value On when the counter current value equals the value in V/ SP urrent = target value On when the counter current value equals the value in V/4 SP urrent = target value On when the counter current value equals the value in V/ SP0 urrent = target value On when the counter current value equals the value in V/0 SP urrent = target value On when the counter current value equals the value in V/ SP urrent = target value On when the counter current value equals the value in V/4 SP urrent = target value On when the counter current value equals the value in V/ SP4 urrent = target value On when the counter current value equals the value in V/0 SP urrent = target value On when the counter current value equals the value in V0/0 SP urrent = target value On when the counter current value equals the value in V0/04 SP urrent = target value On when the counter current value equals the value in V0/0 L0 Micro PL User Manual, rd Edition, Rev. -

6 ppendix : Special Relays ounter Mode Equal Relays SP0 urrent = target value On when the counter current value equals the value in V/ SP urrent = target value On when the counter current value equals the value in V/ SP urrent = target value On when the counter current value equals the value in V/ SP urrent = target value On when the counter current value equals the value in V/ SP4 urrent = target value On when the counter current value equals the value in V/0 SP urrent = target value On when the counter current value equals the value in V/ SP urrent = target value On when the counter current value equals the value in V/4 SP urrent = target value On when the counter current value equals the value in V/ SP00 urrent = target value On when the counter current value equals the value in V/0 SP0 urrent = target value On when the counter current value equals the value in V/ SP0 urrent = target value On when the counter current value equals the value in V/4 SP0 urrent = target value On when the counter current value equals the value in V/ SP04 urrent = target value On when the counter current value equals the value in V4/40 SP0 urrent = target value On when the counter current value equals the value in V4/4 SP0 urrent = target value On when the counter current value equals the value in V4/44 SP0 urrent = target value On when the counter current value equals the value in V4/4 SP urrent = target value On when the counter current value equals the value in V/0 SP urrent = target value On when the counter current value equals the value in V/ SP urrent = target value On when the counter current value equals the value in V/4 SP urrent = target value On when the counter current value equals the value in V/ SP urrent = target value On when the counter current value equals the value in V/0 SP urrent = target value On when the counter current value equals the value in V/ SP urrent = target value On when the counter current value equals the value in V/4 SP urrent = target value On when the counter current value equals the value in V/ - L0 Micro PL User Manual, rd Edition, Rev.