
1-13
System Overview
SIMATIC 545/555/575 System Manual
Two I/O channels are available for expansion I/O.
• The Series 505 channel supports Series 505 and Series 500 remote I/O.
NOTE: To upgrade your Series 500 installation to a Series 505 system while
keeping your Series 500 remote I/O bases, see Appendix C.
• The PROFIBUS-DP I/O channel supports PROFIBUS-DP I/O masters,
slaves, and field devices, and also Series 505 remote I/O (by means of
the DP RBC, PPX:505–6870).
Both I/O channels are supported by the 545–1104 and all models of the 555
CPUs. Annex cards are available to allow the 575 CPUs to access either
channel: the PPX:575–2126 is used with the Series 505 remote I/O channel,
and the PPX:505–CP5434–DP is used with the PROFIBUS-DP I/O channel.
Only one annex card can be used per 575 CPU; the annex card mounts on
the CPU, and does not require a separate VME slot. One annex card, the
PPX:505–CP5434–DP, is available for the 545–1103 CPU; the 545–1103 can
only access Series 505 remote I/O by means of the 505 PROFIBUS-DP RBC.
Table 1-3 offers a breakdown of the types of I/O, local and remote, supported
by the various CPU models.
Table 1-3 I/O Options
Local I/O Expansion I/O
CPU
I/O Type Max # of Slots Series 505 PROFIBUS-DP
1
545–1103/1105 Series 505 16 Not supported 32 devices
2
545–1104/1106 Series 505 16 15 bases 112 devices
555–1103/1104 Series 505 16 15 bases 112 devices
555–1105/1106 Series 505 16 15 bases 112 devices
575–2104
575–2105/2106
VME 14
3
15 bases
4
112 devices
2
1
The number for devices supported includes both masters and slaves.
2
Optional for this system. Requires installation of PPX:505–CP5434–DP annex card.
3
Assumes 2 slots taken for at least one 575 CPU.
4
Optional for this system. Requires installation of PPX:575–2126 annex card.
NOTE: You cannot use some early model (pre-1989) Series 505 I/O modules
with a 545, 555, or 575 CPU. Refer to Appendix B for details about
compatibility.
Expansion I/O
I/O Channel
Support
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