SIMATIC S7 Ethernet
Consecutive Equipment Addresses
Overview
The following table lists the maximum number of consecutive addresses that can be read by each PLC. Refer to this table when using block transfers.
Note:
zTo speed up data communication, use consecutive variable addresses on the same panel screen.
zThe following situations increase the number of times that the equipment is read, which reduces the data communication speed between the target machine and the equipment:
z when the number of consecutive addresses exceeds the maximum z when different device types are used.
Device | Max. Consecutive Addresses | Gap Span | ||
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| Read | Write |
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Input (I) |
|
|
| |
Output (Q) |
|
|
| |
Internal Bit (M) |
|
|
| |
Data Block (DBX) | 218 bytes | 212 bytes | 218 bytes | |
Input (IW) | ||||
|
|
| ||
Output (QW) |
|
|
| |
Internal Bit (MW) |
|
|
| |
Data Block (DBW) |
|
|
| |
Timer Word (T) |
| 1 word | — | |
Counter Word (C) |
| |||
|
|
| ||
15