## 4 Results and Discussion
Layer 3 contains the remote admin host, webserver dashboard, the chosen low-cost ERP system ERP Next and the file server in a virtual environment, which can be accessed by the client by authorized workstations. To prevent unauthorized access and cyber-attacks, a firewall was installed between layers 2 and 3, which only allows layer 3 to query layer 2. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Machine** & **DAQ** & **Protocol** & **Resolution** & **Frequency** \\ \hline Rolling mill & Wago PFC200 750-8212 & & Modbus TCP/IP & 15 bit & 500 Hz \\ (MF) & (+1/O modules) & & Modbus TCP/IP & 15 bit & 500 Hz \\ \hline Furnace & Wago PFC200 750-8212 & & Modbus TCP/IP & 15 bit & 500 Hz \\ (MF) & (+1/O modules) & & Modbus TCP/IP & 15 bit & 500 Hz \\ \hline Continuous & & Internal DAQ & Modbus TCP/IP & 15 bit & \textgreater{}100 Hz \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Utilized machines and DAQ with technical specifications within the MUL 4.0 project. Figure 5: Qualitative illustration of the implemented IT layer system of the MUL 4.0 project. Figure 6 visualizes the resulting adapted architecture, based on the RAMI 4.0 concept. Tables 5-10 concretizes the corresponding areas within this adapted model. Figure 6: RAMI 4.0 framework adapted to the case of the MUL 4.0 project. \begin{table}
\begin{tabular}{c c} \hline \hline
**Layer Fragment** & **Specification** \\ \hline It1.1 & RFID chip \\ It1.2 & Continuous caster DAQ according to Table 4 + Internal Software \\ It1.3 & GUI + Webserver Dashboard Server (DHCP) \\ It1.4 & CPPS + IIoT \\ It1.5 & MES Server + DHCP protocol \\ It1.6 & ERP Next Server + DHCP protocol \\ It2.1 & RFID chip \\ It2.2 & Furnace DAQ according to Table 4 + Wago eI\(\ddot{\text{c}}\)Cockpit Software \\ It2.3 & GUI + Webserver Dashboard Server (DHCP) \\ It2.4 & CPPS + IIoT \\ It2.5 & MES Server + DHCP protocol \\ It2.6 & ERP Next Server + DHCP protocol \\ It3.1 & RFID chip \\ It3.2 & Rolling mill 1 hydraulic press DAQ according to Table 4 + Wago eI\(\ddot{\text{c}}\)Cockpit Software \\ It3.3 & GUI + Webserver Dashboard Server (DHCP) \\ It3.4 & CPPS + IIoT \\ It3.5 & MES Server + DHCP protocol \\ It3.6 & ERP Next Server + DHCP protocol \\ It4.1 & RFID chip \\ It4.2 & Tensile test machine 1 Recycling aggregate DAQ + Software \\ It4.3 & GUI + Webserver Dashboard Server (DHCP) \\ It4.4 & CPPS + IIoT \\ It4.5 & MES Server + DHCP protocol \\ It4.6 & ERP Next Server + DHCP protocol \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Integration layer fragments from Figure 6 and corresponding specifications. \begin{table}
\begin{tabular}{c c} \hline \hline
**Layer Fragment** & **Specification** \\ \hline A1.1 & Continuous casted specimen \\ A1.2 & Sensors of continuous casted according to Table 3 \\ A1.3 & Tablet/PC \\ A1.4 & Continuous Caster \\ A1.5 & Center for Non-Ferrous Metallurgy \\ A1.6 & NFM \\ A2.1 & Heat treated specimen \\ A2.2 & Sensors of furnace according to Table 3 \\ A2.3 & Tablet/PC \\ A2.4 & Furnace \\ A2.5 & Center for Metal Forming \\ A2.6 & MF \\ A3.1 & Formed specimen \\ A3.2 & Sensors of rolling mill 1 hydraulic press according to Table 3 \\ A3.3 & Tablet/PC \\ A3.4 & Rolling mill 1 Hydraulic press \\ A3.5 & Center for Metal Forming \\ A3.6 & MF \\ A4.1 & Quality checked specimen 1 Recycled specimen \\ A4.2 & Sensor of tensile test machine 1 recycling aggregate \\ A4.3 & Tablet/PC \\ At.4 & Tensile test machine 1 Recycling aggregate \\ At.5 & Center for Metal Forming \\ At.6 & MF \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Asset layer fragments from Figure 6 and corresponding specifications.