batch reactor interlock (graphical LD)¶


suite id	`g_batch_reactor`
domain	chemical_batch
language	LD-graphical
difficulty	medium
validation status	validated
origin	authored
license	CC-BY-4.0

Authored for this suite to cover this domain with genuine control logic

What is proved¶

From benchmarks/chemical_batch/g_batch_reactor/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`	`!(feed_valve && overpressure)`	The feed valve must never open while the reactor is over-pressure.

Variants¶

file	expected verdict	violates	method
`clean.xml`	SAFE	none	expert
`bomb.xml`	VIOLATION	`P1`	fault-injection

Files¶

file	what it is	size	sha256
`benchmark.yml`	benchmark metadata	1.0 KB	`bf7dcf012d64`
`bomb.xml`	ladder program, PLCopen XML	3.2 KB	`5534627f0e55`
`clean.xml`	ladder program, PLCopen XML	2.7 KB	`24b9dfb45c23`
`props.yaml`	property file	0.2 KB	`c0e51b86cfa8`
`weakened.props.yaml`	property file	0.5 KB	`d3b5631b36ec`

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.

bomb.xmlclean.xml

PROGRAM g_batch_reactor_bomb
VAR_INPUT
    feed_cmd : BOOL;
    overpressure : BOOL;
    enable : BOOL;
    maint : BOOL;
END_VAR

VAR_OUTPUT
    feed_valve : BOOL;
    vent : BOOL;
END_VAR


feed_valve := (((NOT overpressure OR (overpressure AND maint)) AND feed_cmd) AND enable);
vent := overpressure;

END_PROGRAM

PROGRAM g_batch_reactor_clean
VAR_INPUT
    feed_cmd : BOOL;
    overpressure : BOOL;
    enable : BOOL;
    maint : BOOL;
END_VAR

VAR_OUTPUT
    feed_valve : BOOL;
    vent : BOOL;
END_VAR


feed_valve := ((NOT overpressure AND feed_cmd) AND enable);
vent := overpressure;

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.

batch_reactor_weakened (weakened.props.yaml, expected VIOLATION): master SAFE
g_batch_reactor__bomb (props.yaml, expected VIOLATION): v8.4 VIOLATION
g_batch_reactor__bomb__viac via C (props.yaml, expected VIOLATION): master VIOLATION
g_batch_reactor__clean (props.yaml, expected SAFE): v8.4 SAFE
g_batch_reactor__clean__viac via C (props.yaml, expected SAFE): master SAFE