Chapter 7: sDIO Module 7.6 sDIO Digital I/O Signals The sDIO module’s digital I/O signals are 64 optically-isolated digital I/O channels (32 output and 32 input). They are wired to connectors X1 through X4, which are located on the front of the sDIO module (see the figure sDIO Connectors and Indicators on page 61). The electrical spe- cifications for the inputs are similar to the XDIO inputs, but have a different wiring con- figuration. The sDIO inputs cannot be used for REACTI programming or high-speed interrupts. See the eV+ Language User's Guide for information on digital I/O programming. NOTE:
The signals on the sDIO connectors can be superseded by another sDIO module that is installed and addressed as sDIO #1. To use two sDIO modules, address the first as sDIO #1 and the second as sDIO #2. sDIO Inputs The 32 input channels are arranged in four groups of eight. Each group is electrically isolated from the other groups and is optically isolated from the sDIO module’s circuitry. The eight inputs within each group share a common ground. The inputs are accessed through the two female 26-pin D-sub input connectors on the front of the sDIO module. Each connector provides access to two input groups. Each group requires ten pins: eight input signals, and two ground references.
An input is activated by providing a positive potential on its input pin relative to the ground pin of its group. This type of input is considered sinking. That is, current must flow into the input pin to turn it on. Table 7-2. sDIO Input Specifications SmartController EX User’s Guide, 11069-000 Rev.
F Page 68 of 92 Operational voltage range 0 to 30 VDC OFF state voltage range 0 to 3 VDC ON state voltage range 10 to 30 VDC Typical threshold voltage V = 8 VDC in Operational current range 0 to 7.5 mA OFF state current range 0 to 0.5 mA ON state current range 2.5 to 7.5 mA Typical threshold current 2.0 mA Impedance (V /I ) in in 3.9 K Ωminimum Current at V = +24 VDC in I ≤ 6 mA in Turn on response time (hardware) Software scan rate/response time 5 µsec maximum 1 ms scan cycle/ 1 ms max response time Turn off response time (hardware) Software scan rate/response time 5 µsec maximum 1 ms scan cycle/ 1 ms max response time