PMAC Product Guide General-Purpose Digital Inputs and Outputs (JOPTO Port) PMAC’s J5 or JOPTO connector provides eight general-purpose digital inputs and eight general-purpose digital outputs. Each input and each output has its own corresponding ground pin in the opposite row. The 34-pin connector was designed for easy interface to OPTO-22 or equivalent optically isolated I/O modules. The JOPTO port has these characteristics:
• 16 I/O points (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. Parallel (fast) communications to PMAC CPU • Not opto-isolated; easily connected to Opto-22 (PB16) or similar modules through ACC-21F cable Jumper E7 controls the configuration of the eight inputs. If it connects pins 1 and 2 (the default setting), the inputs are biased to +5V for the OFF state, and they must be pulled low for the ON state.
If E7 connects pins 2 and 3, the inputs are biased to ground for the OFF state, and must be pulled high for the ON state. In either case, a high voltage is interpreted as a 0 by the PMAC software and a low voltage is interpreted as a 1. PMAC is shipped standard with a ULN2803A sinking (open-collector) output IC for the eight outputs. These outputs can sink up to 100 mA, but must have a pull-up resistor to go high. Warning: Do not connect these outputs directly to the supply voltage, or damage to the PMAC will result from excessive current draw.
A high-side voltage (+5 to +24V) can be provided into Pin 33 of the JOPTO connector which allows this to pull up the outputs by connecting pins 1 and 2 of Jumper E1. Jumper E2 must also connect pins 1 and 2 for a ULN2803A sinking output. It is possible for these outputs to be sourcing drivers by substituting a UDN2981A IC for the ULN2803A. This U26 IC is socketed, and so may easily be replaced. For this driver, pull-down resistors should be used. With a UDN2981A driver IC, Jumper E1 must connect pins 2 and 3, and Jumper E2 must connect pins 2 and 3. Warning: The jumper setting must match the type of driver IC, or damage to the IC will result Example:
Standard configuration using the ULN2803A sinking (open-collector) output IC Machine Connections 33