Accessory 24E2S
Hardware Setup
9
Acc-24E2 Limit and Flag Wiring
The Acc-8F allows the use of sinking or sourcing position limits and flags to the PMAC2. The opto-
isolator IC used is a PS2705-4NEC-ND quad photo-transistor output type. This IC allows the current to
flow from return to flag (sinking) or from flag to return (sourcing).
A sample of the positive limit circuit is shown below. The 4.7K resistor packs used will allow 12-24V
flag inputs. If 0-5V flags are used, then a 1k
resistor pack (RP) can be placed in either RP38, RP42,
RP47, or RP51 (refer to the Resistor Pack Configuration section of this manual).
Connecting Limits/Flags to the Acc-24E2
The following diagram illustrates the sinking and sourcing connections to an Acc-24E2. This example
uses 12-24V flags.
Loss of Encoder Circuit
The encoder-loss detection circuitry works for differential incremental encoders only. In proper
operation, the digital states of the complementary inputs for a channel (e.g. A and A/) always should be
Sinking,
Separate
Supply
Sourcing,
Separate
Supply
