[Claim 1] A display control device comprising:
an acquisition unit to acquire a value of a signal outputted from an apparatus during
execution of a control program which controls the apparatus; and
5 a control unit to control a display device to display a code of the control program on
a screen, and to display the value of the signal acquired by the acquisition unit, on a portion
in the code which corresponds to the signal, in a format that enables distinction of a state of
the apparatus of a time the value of the signal is outputted.
[Claim 2] The display control device according to claim 1,
10 wherein, in displaying a value outputted when the apparatus is in an unsteady state,
as a value of the signal, the control unit controls the display device to simultaneously display
a value outputted when the apparatus is in the steady state.
[Claim 3] The display control device according to claim 1 or 2, further comprising:
an operation unit to accept an operation of selecting a display-subject period of the
15 signal from among two or more periods during which a value, different from a value
outputted when the apparatus is in a steady state, is outputted as the value of the signal,
wherein the acquisition unit acquires, as a value of the signal, a value of a signal outputted during the period selected by operating the operation unit.
[Claim 4] The display control device according to claim 1 or 2, further comprising:
20 an operation unit to accept an operation of selecting a display-subject period of the
signal from among two or more periods during which a value with an abnormality degree exceeding a threshold value is outputted as a value of the signal,
wherein the acquisition unit acquires, as a value of the signal, a value of a signal
outputted during the period selected by operating the operation unit.
25 [Claim 5] The display control device according to any one of claims 1 to 4,
wherein the control unit controls the display device to further display an abnormality

degree of a value of the signal.
[Claim 6] The display control device according to any one of claims 1 to 5,
wherein the signal is a binary signal corresponding to either ON or OFF, and
wherein the control unit controls the display device to further display a probability
5 that the signal is ON.
[Claim 7] The display control device according to any one of claims 1 to 4,
wherein the acquisition unit acquires values of a plurality of signals outputted separately from the plurality of apparatuses, as values of the signals, and
wherein the control unit controls the display device to display a value of each signal
10 acquired by the acquisition unit, on a portion in the code which corresponds to each signal, in
a format that enables to distinguish that the value of each signal is outputted in which one of a
case where the plurality of apparatuses are in the steady state as a whole and a case where the
plurality of apparatuses are in the unsteady state as a whole.
[Claim 8] The display control device according to claim 7,
15 wherein the control unit controls the display device to further display an abnormality
degree of a value of each signal.
[Claim 9] The display control device according to claim 7,
wherein the control unit controls the display device to further display an abnormality
degree of a value as an entirety of the plurality of signals.
20 [Claim 10] The display control device according to any one of claims 7 to 9,
wherein each signal is a binary signal corresponding to either ON or OFF, and
wherein the control unit controls the display device to further display a probability that each signal is ON.
[Claim 11] A display system comprising:
25 the display control device according to any one of claims 1 to 10; and
the display device controlled by the control unit to display the code and a value of

the signal.
[Claim 12] A display device comprising a display controlled by a display control
device that acquires a value of a signal outputted from an apparatus during execution of a
control program which controls the apparatus, to display a code of the control program on a
5 screen, and to display the value of the signal acquired by the display control device, in a
format that enables distinction of a state of the apparatus of a time the value of the signal is
outputted.
[Claim 13] A display method comprising:
by a display control device, acquiring a value of a signal outputted from an
10 apparatus during execution of a control program which controls the apparatus; and
by a display device being controlled by the display control device, displaying a code of the control program on a screen, and displaying the value of the signal acquired by the display control device, on a portion in the code which corresponds to the signal, in a format that enables distinction of a state of the apparatus of a time the value of the signal is
15 outputted.