Appendix D
Special Relays
D–3
Special Relays
SP36
Override setup
relay
on when the override function is used.
SP37
Scan control
error
on when the actual scan time runs over the prescribed scan time.
SP40
Critical error
on when a critical error such as I/O communication loss has
occurred.
SP41
Warning
on when a non critical error has occurred.
SP42
Diagnostics error on when a diagnostics error or a system error occurs.
SP44
Program
memory error
on when a memory error such as a memory parity error has
occurred.
SP45
I/O error
on when an I/O error such as a blown fuse occurs.
SP46
Communications
error
on when a communication error occurs on any of the CPU ports.
SP50
Fault instruction
on when a Fault Instruction is executed.
SP51
Watch Dog
timeout
on if the CPU Watch Dog timer times out.
SP52
Grammatical
error
on if a grammatical error has occurred either while the CPU is
running or if the syntax check is run. V7755 will hold the exact error
code.
SP53
Solve logic error
on if CPU cannot solve the logic.
SP54
Communication
error
on whent RX, WX, RD, WT instructions are executed with the wrong
parameters.
SP56
Table instuction
overrun
on if a table instruction with a pointer is executed and the pointer
value is outside the table boundary.
SP60
Value less than
on when the accumulator value is less than the instruction value.
SP61
Value equal to
on when the accumulator value is equal to the instruction value.
SP62
Greater than
on when the accumulator value is greater than the instruction value.
SP63
Zero
on when the result of the instruction is zero (in the accumulator.)
SP64
Half borrow
on when the 16 bit subtraction instruction results in a borrow.
SP65
Borrow
on when the 32 bit subtraction instruction results in a borrow.
SP66
Half carry
on when the 16 bit addition instruction results in a carry.
SP67
Carry
when the 32 bit addition instruction results in a carry.
SP70
Sign
on anytime the value in the accumulator is negative.
SP71
Pointer
reference error
on when the V-memory specified by a pointer (P) is not valid.
SP73
Overflow
on if overflow occurs in the accumulator when a signed addition or
subtraction results in an incorrect sign bit.
SP75
Data error
on if a BCD number is expected and a non–BCD number is
encountered.
SP76
Load zero
on when any instruction loads a value of zero into the accumulator.
System Monitoring
Accumulator
Status
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