Python - Interrupcion bucle para pasar a otro dentro de uno mayor

# -*- coding: utf-8 -*-

"""

Created on Fri Feb 26 12:19:59 2021

@author: ramon

"""

import tclab

import time

lab = tclab.TCLab()

refT1=50

dur=500#tiempo de simulacion

# initialize lists

tm = [dur]

T1a = [dur]

a = [dur]

e= [dur]

res=0

# turn on heater 1

kc=3

eant=0

i=1

ie=0

tau=1

T1a.append(0)

e[0]=0

Kp = 0.54

taup = 185

thetap =10

tauc = max(0.1*taup,0.8*thetap)

Kc = 24

tauI =40

tauD =5

for i in range(dur):

    tm.append(i)

    T1a.append(lab.T1)

    e.append(refT1-T1a[i])

    ie=ie+Kc/tauI*e[i]

    c=T1a[i]-T1a[i-1]

    a.append(Kc*(e[i]-tauD*c)+ie)

    if tm[i]==dur/2:

        refT1=refT1+10

    # elif tm[i]==750:

    #     refT1=refT1+5

    ophi = 100

    oplo = 0

    if res==0 and( a[i] < oplo or a[i] > ophi):

        ie = ie - Kc/tauI * e[i]

        # clip output con windup incluido

        a[i] = max(oplo,min(ophi,a[i]))

        #time.sleep(2)

        eant=e[i]

        print(tm[i],a[i],T1a[i],e[i])

        time.sleep(1)

    res=input()

    if res==1:#introducimos un convertidor manual automatico

        print("cambio a manual")

        res=res+1

    elif res==2:

        print("escriba nueva t de referencia")

        refT1=input()

        print("escriba una nueva duracion")

        dur=input()

        res==0

    lab.Q1(a[i])

lab.close()

tm[0]=0

T1a[0]=T1a[2]

T1a[1]=T1a[2]

tm.append(tm[i])

import matplotlib.pyplot as plt

#matplotlib inline

plt.plot(tm,T1a,'r--',label='T1')

# add plot for temperature 2

plt.ylim([0, 85])

plt.legend()

plt.xlabel('t')

plt.ylabel('T1')

plt.savefig('temperatures.png')

plt.show()

lab.close()