5-12
Connecting TM I/O to PCS 7
C79000-G8076-C710-04
The interface establishes the interconnection between the ISA bus and FM
456-4, independent of the backplane bus. It contains the interface for data
transfer.
The interface logic controls access to the RAM address area of FM 456-4.
This interface handles all data accesses as well as the TPM 478-2 parameters.
The KI/O processor consists of an 80C186 CPU, the I/O bus logic as well as
RAM and FEPROM chips. It interconnects the ISA and I/O bus interfaces.
The TPM 478-2 interface module establishes the connection to the I/O bus
system and controls the process image which is updated at every cycle. The
module also splits the I/O bus system into I/O bus A and B.
Figure 5-7 shows the functions of the interface module in a simplified form.
The various function blocks are described at a later point.
+5 V (from backplane bus)
I/O bus A I/O bus B
Bus driver
Interface (Process image)
Bus driver
I/O bus
Figure 5-7 Function of TPM 478-2
The I/O bus interface is located on the TPM 478-2. The TPM 478-2 interface
module manages the process image and executes specific I/O instructions
required for generating the process image for TELEPERM M I/O modules.
These I/O instructions are decoupled and transferred to the I/O modules via
I/O bus A and B.
The bus driver amplifies the signal for I/O bus B.
Interface to the ISA
bus/backplane bus
I/O processor
Function of
TPM 478-2
Interface to the
I/O bus
Bus drivers
Interface module TPM 478-2
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