| Processor/ Cat. No. | Maximum User Memory Words | EEPROM Module Memory (Words) & Module Number | Total I/O Maximum (any mix) | Analog I/O Max | Program Scan Time / K Word | I/O Scan time/Rack (in a single Chassis, extlocal or remote) | Multiple MCPs / Quantity |
| PLC5/10 (1785LT4) | 6 K | 8K (1785MJ) | •512 (32I/O modules) •256 (16I/O modules) •128 (8I/O modules) | 256 | 2 ms (discrete logic) 8 ms (typical) | N/A | No / 1 |
| PLC5/12 (1785LT3) | 6 K | 8K (1785MJ) | •512 (32I/O modules) •256 (16I/O modules) •128 (8I/O modules) | 256 | 2 ms (discrete logic) 8 ms (typical) | •10 ms @ 57.6 kbps (remote) | No / 1 |
| PLC5/15 (1785LT) | 6K expandable to 10K or 14K | 8K (1785MJ) | •512 (any mix) or •512 in + 512 out (complementary) | 5012 | 2 ms (discrete logic) 8 ms (typical) | •10 ms @ 57.6 kbps (remote) | No / 1 |
| PLC5/25 (1785LT2) | 13K expandable to 17K or 21K | 8 K (1785MJ) or 16 K (1785MK) | •1024 (any mix) or •1024 in + 1024 out (complementary) | 1024 | 2 ms (discrete logic) 8 ms (typical) | •10 ms @ 57.6 kbps (remote) | No / 1 |
| Processor/ Cat. No. | Number of Remote I/O, ExtendedLocal I/O, and DH+ Ports | Maximum Number of I/O Racks | Maximum Number of I/O Chassis | Number of RS 232/ 422/ 423 ports | Remote I/O Transmission Rates 1 | Backplane Current Load | ||
| Total | Ext Local | Remote | ||||||
| PLC5/10 (1785LT4) | •1 DH+ | 1 | 1 | 0 | 0 | 0 | — | 2.5A |
| PLC5/12 (1785LT3) | •1 DH+ •1 Remote I/O (Adapter Only) | 4 | 1 | 0 | 0 | 0 | 57.6 kbps | 2.5A |
| PLC5/15 (1785LT) | •1 DH+ •1 Remote I/O (Adapter or Scanner) | 4 | 13 | 0 | 12 | 0 | 57.6 kbps | 2.5A |
| PLC5/25 (1785LT2) | •1 DH+ •1 Remote I/O (Adapter or Scanner) | 8 | 17 | 0 | 16 | 0 | 57.6 kbps | 2.5A |