SATEC PM180 Installation Manual - Manual (Page 17)

PM180 Substation Automation Unit 14
2.3 Location of Modules
The PM180 provides a total of 6 modules slots: 3 fixed slots for ANALOG, CPU and CT factory installed modules
and 3 general purpose field installable "hot swap" modules slots for input/output, measurement and communication
optional modules. Any type of optional module can be installed in any slot
Figure 2-15 Location of Modules