Siemens S5-135U/155U appendix PG Submodule, Interface Submodule For Use With, Circuitry, Rate

CPUs, Memory Cards, Memory Submodules, Interface Submodules

5.11.2PG Submodule

By means of the PG submodule, you can use the second interface of the CPU as the PG interface and equally privileged with the first interface.

Application The PG submodule can be inserted in the following CPUs:

Interface Submodule

For Use With

PG submodule

CPU 928B CPU 948

Circuitry	The PG submodule is equipped with a transmitter and a receiver for 20 mA
	current loop signals. The loop current is always fed in from the PG. The
	following figure shows the circuitry for current loop signals of the standard
	cable:

+	+
Receiver
±	±
	±
	Transmitter
±	+
	±
Transmitter
+	+
CPU with	+
PG Module	Receiver
Current Direction Arrows	±
	PG

Figure 5-11 PG Submodule: Loop Current Direction

Data Transmission The rate for data transmission via the PG interface is always 9600 bps.

Rate

System Manual	5-95
C79000-G8576-C199-06