Operating mode selection

The EL1502 can be operated in four modes: The setting takes place by the

setting of single-channel operation or operation with two separate channels through the selection of the process data objects
+
Counter settings (up/down counter, gated counter) in the CoE directory.
The following operation modes are possible:

Operation mode

Predefined PDO Assignment

Setting of the counting
direction via CoE directory

switchable outputs

1
(default)

1Ch. +/- Counter:
0x1A02 – CNT Inputs
+
0x1602 – CNT Outputs

Index 0x8020:05:

0: Enable UD counter

  • UD input (terminal point 1):
    sets the counting direction:
    - High level: up;
    - Low level: Down
  • Clock input (terminal point 5):
    indicates the individual pulses.

Output 1

2

Index 0x8020:05:

1: Enable pos. gate

  • Gate is inhibited by a positive level on the gate input (terminal point 1)
  • Clock input (terminal point 5):
    indicates the individual pulses.

+

Index 0x8020:04:

0: up counter
1: down counter

3

Index 0x8020:05:

2: Enable neg. gate

  • Gate is inhibited by a negative level on the gate input (terminal point 1)
  • Clock input (terminal point 5):
    indicates the individual pulses.

+

Index 0x8020:04:

0: up counter
1: down counter

4

2Ch. Counter:
0x1A00 – CNT Inputs Channel 1
0x1A01 – CNT Inputs Channel 2
+
0x1600 – CNT Outputs Channel 1
0x1601 – CNT Outputs Channel 2

Index 0x8000:04 (Channel1) und
Index 0x8010:04 (Channel2)

0:up counter

1:down counter

Counter 1 → Output 1

Counter 2 → Output 2

In addition, the distributed clock function may be activated for the EL1502; see below

Operating mode selection – setting of process data objects (PDO)

The process data to be transmitted (PDO, ProcessDataObjects) can be selected by the user

  • via the "Predefined PDO Assignment" selection dialog; see fig. (E) below. The EL1502 offers a choice of two different "Predefined PDO Assignments":
    • "1Ch.+/-Counter": 0x1A02 and 0x1602 (marked in red in the figure below)
    • "2Ch. Counter": 0x1A00 and 0x1600 for channel1, 0x1A01 and 0x1601 for channel 2 (marked in blue in the fig. below)
  • These can be selected for individual PDOs by selecting the Sync Manager (see fig. A below) and then activating the PDOs (see fig. B below).
    Exclusion criteria prevent irregular combinations. Excluded PDOs have a grey background. Therefore, for example, the PDOs 0x1A00 and 0x1A01 cannot be selected as long as 0x1A02 is activated.

These changes become effective after activation and an EtherCAT restart or a reload.

The assignment of the PDOs to the respective Sync Manager is displayed in the "SM" column in the "PDO List" (see fig. C below). The contents of the PDO selected in the "PDO List" are displayed in the "PDO Content" field (see fig. D below). An overview of the assignment and contents of the PDOs can be found in the chapter "EL1502 PDO assignment".

The active PDOs are displayed in the TwinCAT tree (F) and can be linked.

A detailed description of the PDO selection can be found in the chapter "Detailed description of Process Data tab".

Operating mode selection 1:
EL1502-0000-0021 - Predefined PDO selection

Operating mode selection – Setting in the CoE directory

Single-channel up/down counter, gated counter (operating mode 1-3)

  1. Selection of the predefined PDO assignment "1Ch.+/-Counter"
  2. Selection in index 0x8020:05 (see red marking in figure below). Three selection options are available in the Set Value Dialog:
    • "Enable UD counter" – single-channel up/down counter (operating mode 1)
      If a high signal level is encountered at the up/down input of the terminal (terminal point 1), the counter counts up in the event of positive edges at the clock input (terminal point 5), with a low signal level it counts down. An acknowledgement is made via the PDO "Status of input UD".
    • "Enable pos. gate" – single-channel gated counter locks at high level (operating mode 2)
      The counter is inhibited if a high level is encountered at the gate input of the terminal (terminal point 1). An acknowledgement is made via the PDO "Status of input UD".
      The counting direction is set by index 0x8020:04 (0: up, 1: down).
      The clock input (terminal point 5) indicates the individual pulses.
    • "Enable neg. gate" – single-channel gated counter locks at low level (operating mode 3)
      The counter is inhibited if a low level is encountered at the gate input of the terminal (terminal point 1). An acknowledgement is made via the PDO "Status of input UD".
      The counting direction is set by index 0x8020:04 (0: up, 1: down).
      The clock input (terminal point 5) indicates the individual pulses.

Two-channel up/down counter (operating mode 4)

  1. Selection of the predefined PDO assignment "2Ch. Counter"
    The terminal points 1 or 5 serve as clock input for 32 bit counter 1 or 2.
  2. Selection in the indices 0x8000:04 for channel 1 and 0x8010:04 for channel 2 (see blue marking in figure below). Two selection options are available per channel in the Set Value Dialog:
    • 0: up counter
    • 1: down counter
Operating mode selection 2:
Setting the counter via the CoE directory

Please observe the notes on settings in the CoE directory

Operating mode selection 3:
EL1502-0000-0021 – Standard scope of process data