Skip to main content
Status words, alarm words and bit masks are easier to read bit by bit. Type a value in any format, or click the bits directly, and every other representation updates.

​
What each value means

  • Unsigned (WORD, UINT, DWORD, UDINT): all bits count as a positive number.
  • Signed (INT, DINT): two’s complement. When the highest bit is 1, the number is negative. For 16 bits, FFFF is −1 and 8000 is −32768.
  • BCD: each group of 4 bits holds one decimal digit 0–9. 0x1234 in BCD means 1234. A nibble above 9 is not valid BCD. Older S5/S7 timers and counters, thumbwheel switches and 7-segment displays use BCD.
Siemens byte order: S7 PLCs are big-endian. In MW10, the high byte is MB10 and the low byte is MB11, so bit 0 of the word is M11.0 and bit 8 is M10.0. Turn on Show Siemens addresses in the converter to see this for every bit.

Modbus float converter

Two 16-bit registers to a 32-bit float in all four byte orders.

Drive control word builder

Build PROFIdrive STW1 control words and decode ZSW1 status words.