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Maximum Length of a PCOM - ASCII Protollframe

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Depends on your PLC model.

V2xx and V120 have a buffer size of like 480 bytes.

V570/130/350/1210/1040 have a buffer size of like 960 bytes.

In ASCII protocol ML consumes 8 chars, meaning, you can probably read something like 100-120 MLs in ASCII protocol on V570 (some chars are also taken on header and footer of the ASCII protocol).

GPRS modems reduces the buffer size to like 128-150 bytes.

CANBus also reduces the buffer size.

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