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Saia-Burgess Controls AG
Hardware manual for PCD3 series │ Document 26-789 ENG19│ 2018-06-29
Planning an application
Guidance
2-4
2
2.4
Planning an application
The following aspects should be considered when planning PCD3 applica-
tions:
- The internal load current taken by the I/O modules from the +5V and +V supply
must not exceed the maximum supply current specified for the CPUs, RIOs or
LIOs (PCD3.C200)
-
The CPU or RIO type specifies the maximum number of module carriers and
modules
-
After five PCD3.C100 module carriers, use a PCD3.C200 base unit as I/O bus
amplifier.
-
In keeping with lean automation, it is recommended to leave the first slot in the
CPU basic module free for any subsequent expansions. Both simple I/O mod-
ules and communication modules can be used in this slot.
- The total length of the I/O bus is limited to 15 LIO modules by technical factors;
the shorter, the better.
The PCD3.C200 is used to extend the I/O bus or for the internal power sup-
ply (+5V and +V (24V)) to a module segment.
Please note the following rules:
-
Do not use more than six PCD3.C200s in a single configuration, or the time
delay will exceed the I/O access time.
-
A maximum of five cables PCD3.K106 / .K116 may be used.
100
Saia PCD3.C
100
Saia PCD3.C
200
Saia PCD3.C
6860
ETH 2.1
ETH 2.2
Ethernet 2
USB
Saia PCD3.M
100
Saia PCD3.C
100
Saia PCD3.C
Extension plug
PCD3.K010
Extension cable
PCD3.K106/PCD3.K116
Series 0
Series 1
- Insert a PCD3.C200 after each cable (at the start of a row).
Exception: In a small configuration with no more than 3 PCD3.C1xxs, these
can be supplied from the PCD3.Mxxxx. A PCD3.C200 is not required.