Title: +038=360.000-OU045T_03-PCD2.m4160 PLS SBC - Hardware Manual.pdf
We recommend changing the batteries with the PCD attached to the power supply, to avoid any loss of data.Hardware Manual for the PCD2.M5 Series│Document 26/856; Version EN 09│2012-01-253-31Saia-Burgess Controls Ltd.PCD2.M5_ Classic CPUs and expansion housingsMemory space on the PCD3.12 Memory space on the PCD3.12.1 GeneralThe PCD controllers are fitted with a user program memory and a matching user backup memory as standard. On the PCD, both types are referred to as user memory.User Program Memory (RAM)3The user program memory consists of a RAM (Random Access Memory) and contains the program code and a text and DB memory area. It also contains the extension memory, which also holds DBs and texts (addresses ≥ 4000). On a PCD2. M5_, all DBs and texts are always in RAM. The main difference between the texts and DBs in the text/DB memory segment and those in extension memory is the greater maximum size of DBs and texts.