Application Note Several accessory boards provide discrete digital I/O for PMAC, as well as the digital I/O ports on PMAC itself. This document is intended to help choose the right accessory. > The Acc-14D for the PMAC PC and PMAC Lite, and the Acc-14V for the PMAC VME (Acc-14 is not available for the PMAC STD) have the following characteristics: 48 I/O points per board Up to six boards per PMAC 100 mA per channel, up to 24V Hardware selectable between sinking and sourcing (and totem-pole) in groups of eight; defaults are 5V totem-pole (Option 1; not meant for direct drive intended for Opto-22 or similar connection) or 24V sinking (Option 2) Hardware selectable between inputs and outputs in groups of eight; default is 24 inputs and 24 outputs Not opto-isolated; designed for easy connection to Opto-22 (PB24) and similar boards with Acc-21G cable Parallel (fast) communications to PMAC through the JEXP port Note: Acc-14 can be used also for parallel position feedback by ordering Option 3. This does not come under the category of discrete I/O, so it is not covered here. > The Acc-34, which can connect to any of the versions of PMAC, has the following characteristics: 64 I/O points per board Up to 32 boards per PMAC 400 mA per channel, up to 30V Sinking inputs and outputs only Software selectable between inputs and output in groups of 32 - Opto-isolated Serial (slow) communications to PMAC through the thumbwheel port Requires PMAC firmware version 1.13 or higher (for TWS M-variable form) > The Acc-34A, which can connect to any of the versions of PMAC, has the following characteristics: 64 I/`O points per board Up to 32 boards per PMAC 100 mA per channel, up to 24V Hardware selectable between sinking and sourcing in groups of eight; default is all sourcing Hardware selectable between inputs and outputs in groups of 32; default is 32 inputs and 32 outputs Opto-isolated Serial (slow) communications to PMAC through the thumbwheel port Requires PMAC firmware version 1.13 or higher (for TWS M-Variable form) > Selecting Digital I/O Accessories for PMAC 1 size="-1">

Application Note The Acc-27, which can connect to any of the versions of PMAC, has the following characteristics: 16 I/O points per board One board only per PMAC; no other accessories on thumbwheel port - 100 mA per channel, up to 24V Hardware selectable between sinking and sourcing in groups of eight; default is all sinking (inputs can be changed simply by moving a jumper; sourcing outputs must be special-ordered or field configured) Eight inputs, eight outputs only; no changes Opto-isolated Parallel (fast) communications to PMAC through the thumbwheel port > The JOPTO port on PMAC PC, Lite,...