ton single (graphical LD twin)¶


suite id	`g_ton_single`
domain	hvac
language	LD-graphical
difficulty	easy
validation status	candidate
origin	authored
license	CC-BY-4.0
syntax pair of	`ld_ton_single`

Graphical PLCopen XML twin of the K-LD textual benchmark; PT is a duration literal resolved against the task interval

What is proved¶

From benchmarks/hvac/g_ton_single/props.yaml. What each kind claims, and what it becomes on either route, is on The properties we prove.

id	kind	claim	requirement
`P1`	`invariant`	`!Light \|\| Btn`	The on-delay light can be on only while the button is (or was recently) pressed.

Variants¶

file	expected verdict	violates	method
`program.xml`	SAFE	none	expert

Files¶

file	what it is	size	sha256
`benchmark.yml`	benchmark metadata	0.7 KB	`3371bf0663fc`
`program.xml`	ladder program, PLCopen XML	2.8 KB	`50944a2342fa`
`props.yaml`	property file	0.2 KB	`11304a121ae8`

Structured text, derived¶

Read off the ladder graph by runner/ld_to_st.py: every rung's contacts and coils rewritten as IEC 61131-3 assignments, in the same series/parallel logic the PLCopen XML encodes. This is a reading aid, not a second source of expected verdicts; ESBMC verifies the ladder program shown above, never this rendering.

program.xml

PROGRAM g_ton_single
VAR_INPUT
    Btn : BOOL;
END_VAR

VAR_OUTPUT
    Light : BOOL;
END_VAR

VAR
    TON0 : TON;
END_VAR


TON0(IN:=Btn, PT:=T#30ms);
Light := TON0.Q;

END_PROGRAM

Recorded runs¶

A task can carry two routes. ld is ESBMC's ladder front end reading the program directly. via C is the same solver reached through Beremiz and MatIEC, which is the only route that reaches ST, IL, FBD and SFC; see How ESBMC-PLC works.

ton_single (props.yaml, expected SAFE): master SAFE