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Siemens PPI

WebHMI supports work with Siemens S7-200 controllers over the PPI protocol.

In the S7 PPI protocol, the following registers are supported:

Register	Description	Data type	Read/Write
Qx.y	PLC digital outputs. X — offset address, Y — bit number. Bits, bytes and words can be addressed. Examples: Q0.2, QB2, QW0, QD2	Bit, Byte, Word, Double Word	Read/Write
Ix.y	PLC digital inputs. X — offset address, Y — bit number. Bits, bytes and words can be addressed. Examples: I0.2, IB2, IW0, ID2	Bit, Byte, Word, Double Word	Read/—
Mx.y	М - memory. X — offset address, Y — bit number. Bits, bytes and words can be addressed. Examples: M0.2, MB2, MW0, MD2	Bit, Byte, Word, Double Word	Read/Write
Vx.y	V memory blocks. X — offset address, Y — bit number. Bits, bytes and words can be addressed. Examples: V0.2, VB2, VW0, VD2	Bit, Byte, Word, Double Word	Read/Write
Tx	Timers. X — timer number. Examples: T1, T3, T44	Double Word	Read/-
Cx	Counters. X — counter number. Примеры: C1, C3, C44	Double Word	Read/-

Note that although WebHMI correctly recognizes addresses with the data type included in them (for example, IW0 in the notation Siemens stands for a Word type register), but the data type from the address itself is ignored and instead the data type specified in the settings of this register is used In WebHMI. I.e. the address is used exclusively as an start address and in fact, the three addresses IW0, IB0, ID0 are equivalent to the record I0.