Hardware Manual for the PCD2.M5 Series│Document 26/856; Version EN 12│2014-07-24
Saia-Burgess Controls AG
Planning an application
Overview
2-2
2
2.3
Planning an application with PCD2.M5_ components
The following aspects should be considered when planning PCD2.M5_ applications:
●
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 or LIOs
(PCD2.C2000/C1000)
●
The CPU type determines the maximum number of modules
●
The total length of the I/O bus is limited by technical factors; the shorter, the
better
When planning an application, we recommend the following procedure:
Select the I/O modules according to your requirements.
Check that the number of module holders is allowed:
PCD type
Max. number of I/O modules
Max.
1)
digital I/Os
PCD2.M5_
PCD2 CPU
PCD2
expansion
Total
PCD2 CPU
PCD2
expansion
Total
8
56
64
128
896 (-1)
1024 (-1)
1) Using digital I/O modules with 16 I/Os each
The values in brackets have to be subtracted from the maximum number of digital I/
Os because of the watchdog relay.
To expand PCD2 CPUs with PCD3 RIOs, the planning instructions in the PCD3
Manual 26/789 should be followed.
If necessary, select the PCD2.C2000/C1000 expansion housing:
●
PCD2.C2000 8 module slots or PCD2.C1000 4 module slots
●
PCD2.K106 26-core extension cable to connect PCD2 CPUs.
●
PCD3.K1x6 26-core extension cable to connect the last PCD2.C2000
/C1000 expansion housing in a row to attached further
rows of PCD2.C2000/C1000 expansion housings.
●
PCD2.K010 Connector to link PCD2.C2000 expansion housings
for
mounting
side-by-side.
For the connecing cables and plugs required, see also section 3.4.3.
If PCD2.Wxxx and PCD2.Hxxx modules are used, calculate the load current
at the in5V and V+ supply (use the worst, i.e. highest values)
Check that the max. supply current for the CPU is sufficient; it generally should
be.
Estimate consumption from the 24 V supply. Use estimated values. The
estimated values can be found in the section on the Current consumption of the
PCD2 input/output modules.
Note that in most applications the outputs place the heaviest load on the 24 V
supply. For 16 outputs with a load current of 0.5 A each, the loading will be 8 A with
all outputs connected.