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1-9GFK-0787B Chapter 1 Introduction
Number of I/O Points in a GMR System
The I/O capacity of the system depends on whether the CPU is a model 788 or model 789. For
most applications, these limits will not be reached. If you need help estimating I/O sizes for a
large application, contact GE Fanuc at 1-800-828-5747.
CPU Model Total Discrete
Physical I/O
Maximum
Number of
Voted Inputs
Maximum
Number of
Voted Outputs
Maximum Total
Voted I//O
788 352 112 80 100
798
12288 2048 2048 4096
Non-GMR I/O: Non-GMR I/O is I/O that is not included in the GMR configuration. The
amount of non-GMR I/O that can be used depends on the amount of GMR I/O present and
the CPU memory capacity. The tables below show how much memory is available for
non-GMR I/O (main part of tables) for given numbers of GMR inputs and GMR outputs. In
the equations, the GMR Inputs and GMR Outputs are the actual number of I/O configured
with the programming software.
Number of Non-GMR I/O Available for the 788 CPU
Number of
Voted GMR
Number of Redundant GMR Outputs
Voted GMR
Inputs
0 16 32 48 64 80 96
0 352 288 224 160 96 32
16
304 240 176 112 48
32
256 192 128 64 0
48
208 144 80 16
64
160 96 32
80
112 48
96
64 0
112
16
Number of Non-GMR I/O Available for the 789 CPU
These numbers are determined by the limits of physical I/O based on the Logicmaster
configuration and table size limitations based on the manner in which GMR maps I/O into
multiple locations in the I/O tables (this is explained in chapter 4).
Number
of Voted
GMR
Number of Redundant GMR Outputs
of Voted
GMR
Inputs
0 256 512 768 1024 1280 1536 1792 2048
0
12288 11264 10240 9216 8192 7168 6144 5120 4096
256
11264 10496 9472 8448 7424 6400 5376 4352 3328
512
10240 9728 8704 7680 6656 5632 4608 3584 2560
768
9216 8960 7936 6912 5888 4864 3840 2816 1792
1024
8192 7936 7168 6144 5120 4096 3072 2048 1024
1280
7168 6912 6400 5376 4352 3328 2304 1280 256
1536
6144 5888 5632 4608 3584 2560 1536 512
1792
5120 4864 4608 3840 2816 1792 768
2048
4096 3840 3584 3072 2048 1024