Hardware Manual PCD1.M2110R1 │ Document 27-619 │ Version ENG 04 │ 2018-08-20
Saia-Burgess Controls AG
Introduction
Orientation
2-5
2
The CPU’s on-board inputs and outputs can be assigned to flags and registers
(media mapping) by the programmer using the Device Configurator (Device Con
-
figurator in the Saia PG5
®
tool). If IOs are media-mapped, these IOs cannot be
reached directly from the program.
Watchdog relay address “O 255”
The address O 255 is reserved for the watchdog relay. The closing relay contact
connection is located at connector X3.
You can find additional details in Chapter 3.8 Hardware watchdog. Please read
this information.
Plug-in input and output modules
If space permits on the housing cover, it will show the input/output addresses.
What if the cover has been temporarily removed?
Each I/O module slot is assigned an address range from 0 to 15, i.e. 16 address-
es. Each slot in turn has been assigned a fixed base address at intervals of 16
addresses. In this case too, the count starts at 0. I/O module slots are designated
Slot0, Slot1, etc.
For the PCD1.M2_ the two I/O slots have the following base addresses:
Slot 0 (top left) = Base addr. 0
(first element address of module)
Slot 1 (top right) = Base addr. 16
(first element address of module)
The base address of each plug-in module is therefore the following: Slot number x
16 = Base address.
The address of an input or output (‘element’ for short) is derived from the base
address of the slot plus the added element address on the module itself (usually
address 0..7 or sometimes 0..15).
Example:
Where is address 20?
Address 20 / 16 = 1 remainder 4
Therefore:
Slot 1
Address 4 on the module
