In this web page, node-red-contrib-s7 (node) - Node-RED, this is wrong, M3.2
M3.2
Boolean Bit 2 of byte 3 of memory area, if you write M3.2, appers the next error:
Error: PLC error [0x8104]: This service is not implemented on the module or a frame error was reported
The correct syntaxis are M,3.2 and the proble is solved